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<html class="no-js" lang="nl-NL">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
<style>
#wpadminbar #wp-admin-bar-vtrts_free_top_button .ab-icon:before {
content: "\f185";
color: #1DAE22;
top: 3px;
}
</style>
<style>img:is([sizes="auto" i], [sizes^="auto," i]) { contain-intrinsic-size: 3000px 1500px }</style>
<style id="classic-theme-styles-inline-css" type="text/css">
/*! This file is auto-generated */
.wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc( + 2px);font-size:}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none}
</style>
<style id="global-styles-inline-css" type="text/css">
:root{--wp--preset--aspect-ratio--square: 1;--wp--preset--aspect-ratio--4-3: 4/3;--wp--preset--aspect-ratio--3-4: 3/4;--wp--preset--aspect-ratio--3-2: 3/2;--wp--preset--aspect-ratio--2-3: 2/3;--wp--preset--aspect-ratio--16-9: 16/9;--wp--preset--aspect-ratio--9-16: 9/16;--wp--preset--color--black: #000000;--wp--preset--color--cyan-bluish-gray: #abb8c3;--wp--preset--color--white: #ffffff;--wp--preset--color--pale-pink: #f78da7;--wp--preset--color--vivid-red: #cf2e2e;--wp--preset--color--luminous-vivid-orange: #ff6900;--wp--preset--color--luminous-vivid-amber: #fcb900;--wp--preset--color--light-green-cyan: #7bdcb5;--wp--preset--color--vivid-green-cyan: #00d084;--wp--preset--color--pale-cyan-blue: #8ed1fc;--wp--preset--color--vivid-cyan-blue: #0693e3;--wp--preset--color--vivid-purple: #9b51e0;--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple: linear-gradient(135deg,rgba(6,147,227,1) 0%,rgb(155,81,224) 100%);--wp--preset--gradient--light-green-cyan-to-vivid-green-cyan: 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0px rgba(0, 0, 0, 1);}:where(.is-layout-flex){gap: ;}:where(.is-layout-grid){gap: ;}body .is-layout-flex{display: flex;}.is-layout-flex{flex-wrap: wrap;align-items: center;}.is-layout-flex > :is(*, div){margin: 0;}body .is-layout-grid{display: grid;}.is-layout-grid > :is(*, div){margin: 0;}:where(.){gap: 2em;}:where(.){gap: 2em;}:where(.){gap: ;}:where(.){gap: ;}.has-black-color{color: var(--wp--preset--color--black) !important;}.has-cyan-bluish-gray-color{color: var(--wp--preset--color--cyan-bluish-gray) !important;}.has-white-color{color: var(--wp--preset--color--white) !important;}.has-pale-pink-color{color: var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-color{color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-color{color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-color{color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-color{color: 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var(--wp--preset--color--pale-pink) !important;}.has-vivid-red-border-color{border-color: var(--wp--preset--color--vivid-red) !important;}.has-luminous-vivid-orange-border-color{border-color: var(--wp--preset--color--luminous-vivid-orange) !important;}.has-luminous-vivid-amber-border-color{border-color: var(--wp--preset--color--luminous-vivid-amber) !important;}.has-light-green-cyan-border-color{border-color: var(--wp--preset--color--light-green-cyan) !important;}.has-vivid-green-cyan-border-color{border-color: var(--wp--preset--color--vivid-green-cyan) !important;}.has-pale-cyan-blue-border-color{border-color: var(--wp--preset--color--pale-cyan-blue) !important;}.has-vivid-cyan-blue-border-color{border-color: var(--wp--preset--color--vivid-cyan-blue) !important;}.has-vivid-purple-border-color{border-color: var(--wp--preset--color--vivid-purple) !important;}.has-vivid-cyan-blue-to-vivid-purple-gradient-background{background: var(--wp--preset--gradient--vivid-cyan-blue-to-vivid-purple) 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!important;}.has-luminous-dusk-gradient-background{background: var(--wp--preset--gradient--luminous-dusk) !important;}.has-pale-ocean-gradient-background{background: var(--wp--preset--gradient--pale-ocean) !important;}.has-electric-grass-gradient-background{background: var(--wp--preset--gradient--electric-grass) !important;}.has-midnight-gradient-background{background: var(--wp--preset--gradient--midnight) !important;}.has-small-font-size{font-size: var(--wp--preset--font-size--small) !important;}.has-medium-font-size{font-size: var(--wp--preset--font-size--medium) !important;}.has-large-font-size{font-size: var(--wp--preset--font-size--large) !important;}.has-x-large-font-size{font-size: var(--wp--preset--font-size--x-large) !important;}
:where(.){gap: ;}:where(.){gap: ;}
:where(.){gap: 2em;}:where(.){gap: 2em;}
:root :where(.wp-block-pullquote){font-size: ;line-height: 1.6;}
</style>
<style id="futurio-stylesheet-inline-css" type="text/css">
.full-head-img {
padding-bottom: 60px;
padding-top: 60px;
}., ., .futurio-woo-content {
padding-left: 0%;
padding-right: 0%;
}
</style>
<style>
.:nth-of-type(n+4):not(.e-lazyloaded):not(.e-no-lazyload),
.:nth-of-type(n+4):not(.e-lazyloaded):not(.e-no-lazyload) * {
background-image: none !important;
}
@media screen and (max-height: 1024px) {
.:nth-of-type(n+3):not(.e-lazyloaded):not(.e-no-lazyload),
.:nth-of-type(n+3):not(.e-lazyloaded):not(.e-no-lazyload) * {
background-image: none !important;
}
}
@media screen and (max-height: 640px) {
.:nth-of-type(n+2):not(.e-lazyloaded):not(.e-no-lazyload),
.:nth-of-type(n+2):not(.e-lazyloaded):not(.e-no-lazyload) * {
background-image: none !important;
}
}
</style>
<style type="text/css" id="futurio-header-css">
.site-title,
.site-description {
position: absolute;
clip: rect(1px, 1px, 1px, 1px);
}
</style>
<style id="kirki-inline-styles">body, a, .nav-subtitle{font-size:17px;font-weight:500;letter-spacing:0px;line-height:1.6;}.news-item a{font-size:26px;font-weight:300;letter-spacing:0px;line-height:1.6;}.news-item .post-excerpt{font-size:16px;font-weight:300;letter-spacing:0px;line-height:1.6;}.top-bar-section{font-size:15px;letter-spacing:0px;text-transform:none;}.site-branding-text a:hover, .site-branding-text .site-title a:hover, .site-branding-text , .site-branding-text .site-title, .site-branding-text a, .site-branding-text .site-title a{font-family:Roboto;font-size:28px;font-weight:900;letter-spacing:0px;line-height:32px;text-transform:uppercase;color:#000000;}{font-size:15px;letter-spacing:0px;line-height:22px;text-transform:none;}#site-navigation, #site-navigation .navbar-nav > li > a, #site-navigation .dropdown-menu > li > a{font-size:13px;letter-spacing:2px;text-transform:uppercase;}#sidebar .widget-title h3{font-size:20px;font-weight:400;letter-spacing:0px;line-height:1.6;}.widget{font-size:15px;font-weight:400;letter-spacing:0px;line-height:1.6;}#content-footer-section .widget{font-size:15px;font-weight:400;letter-spacing:0px;text-transform:none;}#content-footer-section .widget-title h3{font-size:15px;font-weight:400;letter-spacing:0px;line-height:1.6;}.heading-row .site-heading{padding-bottom:15px;padding-top:15px;}.{height:80px;}.site-branding-logo img{max-height:80px;}.heading-menu .site-branding-logo img{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.heading-menu .site-branding-text{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.shrink .{height:50px;}.shrink .site-branding-logo img{max-height:50px;}.shrink .heading-menu .site-branding-logo img{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.shrink .heading-menu .site-branding-text{padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.navbar-nav .menu-button {-webkit-border-radius:3px;-moz-border-radius:3px;border-radius:3px;}.futurio-content{padding-left:10%;padding-right:10%;}.full-head-img{padding-bottom:51px;padding-top:51px;}.full-head-img:after{background-color:rgba(41,152,249,);}.news-thumb img{-webkit-border-radius:46px;-moz-border-radius:46px;border-radius:46px;-webkit-box-shadow:0px 0px 11px 0px rgba(0,0,0,);-moz-box-shadow:0px 0px 11px 0px rgba(0,0,0,);box-shadow:0px 0px 11px 0px rgba(0,0,0,);}@media (max-width: 992px){.heading-row .site-heading{padding-bottom:15px;padding-top:15px;}}@media (max-width: 768px){.heading-row .site-heading{padding-bottom:15px;padding-top:15px;}}@media (min-width: 992px){.{width:25%;}}@media (min-width: 768px){.navbar-nav > li > a, .menu-cart, .menu-account, .top-search-icon, .menu-button, .offcanvas-sidebar-toggle{padding-top:30px;padding-right:10px;padding-bottom:30px;padding-left:10px;}.shrink .navbar-nav > li > a, .shrink .top-search-icon, .shrink .menu-cart, .shrink .menu-account, .shrink .menu-button, .shrink .offcanvas-sidebar-toggle{padding-top:15px;padding-right:10px;padding-bottom:15px;padding-left:10px;}}/* cyrillic-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+0460-052F, U+1C80-1C8A, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F;
}
/* cyrillic */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
/* greek-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+1F00-1FFF;
}
/* greek */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+0370-0377, U+037A-037F, U+0384-038A, U+038C, U+038E-03A1, U+03A3-03FF;
}
/* math */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+0302-0303, U+0305, U+0307-0308, U+0310, U+0312, U+0315, U+031A, U+0326-0327, U+032C, U+032F-0330, U+0332-0333, U+0338, U+033A, U+0346, U+034D, U+0391-03A1, U+03A3-03A9, U+03B1-03C9, U+03D1, U+03D5-03D6, U+03F0-03F1, U+03F4-03F5, U+2016-2017, U+2034-2038, U+203C, U+2040, U+2043, U+2047, U+2050, U+2057, U+205F, U+2070-2071, U+2074-208E, U+2090-209C, U+20D0-20DC, U+20E1, U+20E5-20EF, U+2100-2112, U+2114-2115, U+2117-2121, U+2123-214F, U+2190, U+2192, U+2194-21AE, U+21B0-21E5, U+21F1-21F2, U+21F4-2211, U+2213-2214, U+2216-22FF, U+2308-230B, U+2310, U+2319, U+231C-2321, U+2336-237A, U+237C, U+2395, U+239B-23B7, U+23D0, U+23DC-23E1, U+2474-2475, U+25AF, U+25B3, U+25B7, U+25BD, U+25C1, U+25CA, U+25CC, U+25FB, U+266D-266F, U+27C0-27FF, U+2900-2AFF, U+2B0E-2B11, U+2B30-2B4C, U+2BFE, U+3030, U+FF5B, U+FF5D, U+1D400-1D7FF, U+1EE00-1EEFF;
}
/* symbols */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+0001-000C, U+000E-001F, U+007F-009F, U+20DD-20E0, U+20E2-20E4, U+2150-218F, U+2190, U+2192, U+2194-2199, U+21AF, U+21E6-21F0, U+21F3, U+2218-2219, U+2299, U+22C4-22C6, U+2300-243F, U+2440-244A, U+2460-24FF, U+25A0-27BF, U+2800-28FF, U+2921-2922, U+2981, U+29BF, U+29EB, U+2B00-2BFF, U+4DC0-4DFF, U+FFF9-FFFB, U+10140-1018E, U+10190-1019C, U+101A0, U+101D0-101FD, U+102E0-102FB, U+10E60-10E7E, U+1D2C0-1D2D3, U+1D2E0-1D37F, U+1F000-1F0FF, U+1F100-1F1AD, U+1F1E6-1F1FF, U+1F30D-1F30F, U+1F315, U+1F31C, U+1F31E, U+1F320-1F32C, U+1F336, U+1F378, U+1F37D, U+1F382, U+1F393-1F39F, U+1F3A7-1F3A8, U+1F3AC-1F3AF, U+1F3C2, U+1F3C4-1F3C6, U+1F3CA-1F3CE, U+1F3D4-1F3E0, U+1F3ED, U+1F3F1-1F3F3, U+1F3F5-1F3F7, U+1F408, U+1F415, U+1F41F, U+1F426, U+1F43F, U+1F441-1F442, U+1F444, U+1F446-1F449, U+1F44C-1F44E, U+1F453, U+1F46A, U+1F47D, U+1F4A3, U+1F4B0, U+1F4B3, U+1F4B9, U+1F4BB, U+1F4BF, U+1F4C8-1F4CB, U+1F4D6, U+1F4DA, U+1F4DF, U+1F4E3-1F4E6, U+1F4EA-1F4ED, U+1F4F7, U+1F4F9-1F4FB, U+1F4FD-1F4FE, U+1F503, U+1F507-1F50B, U+1F50D, U+1F512-1F513, U+1F53E-1F54A, U+1F54F-1F5FA, U+1F610, U+1F650-1F67F, U+1F687, U+1F68D, U+1F691, U+1F694, U+1F698, U+1F6AD, U+1F6B2, U+1F6B9-1F6BA, U+1F6BC, U+1F6C6-1F6CF, U+1F6D3-1F6D7, U+1F6E0-1F6EA, U+1F6F0-1F6F3, U+1F6F7-1F6FC, U+1F700-1F7FF, U+1F800-1F80B, U+1F810-1F847, U+1F850-1F859, U+1F860-1F887, U+1F890-1F8AD, U+1F8B0-1F8BB, U+1F8C0-1F8C1, U+1F900-1F90B, U+1F93B, U+1F946, U+1F984, U+1F996, U+1F9E9, U+1FA00-1FA6F, U+1FA70-1FA7C, U+1FA80-1FA89, U+1FA8F-1FAC6, U+1FACE-1FADC, U+1FADF-1FAE9, U+1FAF0-1FAF8, U+1FB00-1FBFF;
}
/* vietnamese */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin-ext */
@font-face {
font-family: 'Roboto';
font-style: normal;
font-weight: 900;
font-stretch: 100%;
font-display: swap;
src: url() format('woff2');
unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
font-family: 'Roboto';
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<p>Pontiac 6x heads specs. The 6X 4 would put your compression at around 10.</p>
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<span class="before-written">Pontiac 6x heads specs. 6X-4 heads w/FT pistons.</span><span class="written-lines">
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<p>Pontiac 6x heads specs Head: Part II . 060" gap. After 1967 the heads were open chamber heads. 4-sold 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10. 77" exhaust valve as opposed to the 1. 66 valves and the stamp location on Pontiac heads. and the correct pistons to get me there. Mar 11, 2021 · I tried a set of 670 heads (72 cc) on a 455 I had in a D-port car one time years ago and I hated it. We also specialize in porting RAII, RAIV, H. BTW, 6X heads were used on Trans Ams along with any other Pontiac car of the period equipped with a 350 or 400 engine. 1:1 they origanially came on the pontiac350 91cc i belive some say 93. Will the stock valves hold up to a Hyd roller? This head package is going on a stroker 400 that will end up 461ci. Since we cannot readily get our hands on heads with such a chamber size, we've chosen a pair of cheap and plentiful 93cc "6X" heads (off a `77 350). 104 #16&62 0. 11/1. 3:1 compression. Those heads have very small valves and would be a bottleneck on a larger performance engine. 42 30 spline Eaton posi street car. With aftermarket aluminum heads you can have the large valves, screw in studs, and run higher compression with flat top pistons and run pump gas, but they are more money. These head numbers represented chamber sizes. Read along to learn about the modifications that Nitemare Per-formance makes to a set of typical 6X heads, like those being Jul 21, 2010 · Right, I want the big HP heads, but between race gas and lead additive I'm leaning towards the 6X heads and letting the 60's head rot in the corner. If they are the 93cc chamber 6X heads, then I would go that route just for that reason alone. These went on 400-461, 400 based pontiac builds. 66"and use a 45 degree seat. Jan 9, 2021 · BIG difference between 6X-4 heads at 92cc and 6X-8 heads at 101cc. 77 valves, screw in studs. My question is, if I use the 6X 8 heads that are milled and confirmed to be 94cc and will be 8. 1:1 cr and 7. 11 heads, I would suggest the following: That said, I would first look to find a set of 5C or 6X/6H heads, particular the 6X heads that were plentiful in the late 70s. I then went overboard and installed a set of 114cc #66 455 heads, which dropped my CR to about 7:1. Not knowing what cam is in the motor I would guess HP at 250 or perhaps a little more. For less than $1000, you can have a qualified Pontiac engine builder build you a set of 6x heads with one piece stainless valves and all the other correct parts. Burning rubber since 1982!! My photobucket, lots of dif car pics. Features Aug 8, 2019 · The 6X heads weren't produced until 1976, 4X were 73/74 heads. 042" (crushed) head gasket, 6 cc valve reliefs for 400 stock pistons, 5 cc for -. 6 compression. To know which 6X heads they are get the secondary code that is stamped onto the verticle outcropping near the valve cover mounting surface. 060 & also mill the intake side. Jul 25, 2024 · The stock 70cc 670 heads were too high for pump gas (94 octane then). With flat top pistons and tight quench you are looking at 9. Mar 27, 2021 · Now, your 140 casting heads are not original to your 65, the 140 casting came fitted on the early 1967 250 hp 326 cid motor and are stated to produce a 9. May 10, 2005 · It seems that Pontiac cylinder heads cast between 1967 and 1972 are typically the most sought after for restorations or performance. 16 heads ('68 Firebird 400, GTO, Grand Prix, Bonneville, Catalina) No. 6:1 respectively. 7L 350ci V8 cylinder head (4X/6X) is synonymous with high performance. Or even get the '69-'70 RAIII heads and do the same. For a basically stock engine, it really doesn't matter. In order to reach this compression ratio with a . 77 exhaust valve, they flow better than any of the earlier big valve D-port heads did. Had the heads baked and blasted at machine shop and then did a bit of cleanup on the rough edges and blended the intake ports into the bowls. 5 compression . 8 compression, what horsepower will I have and is anybody running a lower compression 400 out there. flw file Introducing our 73-79 Pontiac 6. 0 compression (stock crank, heads shaved a bit to raise comp. Both valves are 11/32" stem. 6L - 400ci V8 engines, these 400 Mar 17, 2020 · Most all the normal Pontiac heads flowed about 195 - 200 cfm ( except the RAM AIR with round port exhaust), the 6x will come in around 210-215 cfm @ . Apr 25, 2013 · Horsepower = flow at 28 inches/H2O x 0. If I use the 16 heads, I'll have 10. However, it appeared to many that the Pontiac 350 engine shared the same head with the standard L-78. Thanks, bt Aug 23, 2013 · Those are both cast onto the heads. But if your 4X heads match the 6X 100cc heads, I might want to think on it a little. May 7, 2010 · 6x Heads 6x heads came out in 1975 through 1979. round port heads. 6X Best balanced head (exhaust to intake) 1963 421 SD Best low-lift (under . As a side note, the 350-cube 6X heads have 91cc combustion chambers while 400-cube 6X heads Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Description: 6X I have never seen the elusive 455 6X head which has supposedly been found on some '76 455 4speed T/A's (If I had a 7. 6X-4, 6X-8, and 6H-6 castings. It was for 350's so the chamber is usually in the 91-93 cc range. 74 but i think thats a load of bull you will notice the diffrence and yes the-8 heads are low enought to run a supercharger but i dont know how much boost you would want to run probally want to run a -. Jan 31, 2015 · Well, I do like 6X's, but my favorite head for a street 455 is the 1971 96 D-port head. and S. Just remember that all 455 heads have compression chambers that are too big for your 400. If you want to run a short duration "RV" cam, 6X-4 aren't for you. 500 hp is a pretty stout 400 cid pontiac motor. Jan 20, 2016 · I'd go with 6x heads and around 9:1 compression--not over 9. Mill the 6X heads . Sep 23, 2006 · Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. Well prepared 6X heads will flow PLENTY of air for that deal without heavy porting, but once again the have big combustion chambers so not much squeeze. Sep 30, 2009 · The only Aluminum Pontiac D-port Head We are pleased to introduce to you, our aluminum D-port Pontiac head. They are usually stamped on the machined pads by the valve covers. 225 6x-8 0. 500" lift. We have ported D-Port heads that run low tens in 3,700 lbs. A few cars around 68-71 have 72 cc chambers that would give you about 10-10. O. 6:1 heads with your No. Apr 15, 2017 · The 6X-8 and 6X-6 heads came on 1975-1979 Pontiac 400 engines. 1975-79 No. My main concern is low to mid to torque. In 1967 Pontiac made some open chamber heads(i. With careful prepara-tion, less-celebrated heads can often be improved to flow as well as some of the legends and the af-termarket offerings. The W-72 400's had 6x-4 heads with about 93-94cc. Read Jim Hand's book Chapter 6 on D Port Heads. I typically look for 62's, 46's (1969) or other heads with smaller combustion chambers for 400 builds. 17 350 head Biggest disappointment 1969-70 RA V, 1973-74 455 SD (tie) Mar 20, 2012 · Factory specs were 18 degrees BTDC and . Apr 3, 2003 · If you are planning to do a lot of hot, long highway rides, I would consider having hardened seats put in. 3 to 1 vs 9. stock suspension street GTO's to heads that run 8. 6 to one 6H headed 455 4speed T/A, I would want some 6x's on it too, lol). 257 x number of cylinders. 11" Intake valves and use a 30 degree seat. i had that same combo( 62 heads, . The PY Online Forums is the largest online Dec 20, 2020 · As for non-2. Jul 11, 2024 · Getting compression up will mean pistons if you keep the 6X heads. 140 6X-4 0. it occurs inside Pontiac cylinder heads. Apr 17, 2013 · The #62 Pontiac heads are among the best 1965-1979 Pontiac heads but you should not waste them on a 350 CI engine. e. 6L 400ci V8 - 4X/6X Cylinder Head, Part# ALL-20191. Sep 18, 2019 · 1978 Trans Am original owner 10. Nov 27, 2006 · 6x8 vs 6x4 heads Pontiac - Street 6X-8's are approximately 101 to 104 CC's and 6X-4's are around 93-96 cc's. Crafted to exceed OEM specifications, this cylinder head is a perfect fit for Pontiac enthusiasts seeking peak performance and durability. The A068 Means that the 6X heads were cast January 06, 1978. Mild bowl clean up and ferrea valves. 73 12 bolt 11. Even the heads that you have on there are very good, like George said, but improvements can still be made. To correct for pop-up pistons, subtract dome volume from chamber volume. The 6X is the better of them though. Sep 30, 2009 · I went with a 400 6X because the smaller cc's netted a higher compression ratio on my 455 - it raised it to 9. Apr 3, 2016 · 7K3 are 1972 400-4bbl heads, used on all 4-bbl applications that year. 060" gap was later lowered to . 66" valves. I've had 6x-8s on several Pontiac big cars, they are good heads but nothing special. 24@118. Does any one know if the 6x, 62 and 670 heads have the same valve angle? I know about the differences in cross over port with Pontiac heads and am thinking about changing to either 62 or 670 heads from 6x. If you can find a set of #18 (350 HO) heads, grab them. Bill. 4x's are not made in a small chamber size (93cc) like the 6x-4's. Aug 6, 2019 · A pair of decent used 7F6 heads would have more value in a true '72 HO car restoration & the sales return could easily pay for a well street ported (250-260 cfm) pair of 6X-4's or 6X-8's, or a pair of 87cc chamber E heads, if thats your desire. Find the casting number, year, factory application, chamber volume and CC's of Pontiac heads from 1958 to 1979. 030" off the intake side and your compression ratio will end up in the 9:1 range, and possibly as high as 9. Any customized work from Butler is at least 90 days and crate engines are up to 1 year to complete an order. Pontiac redesigned the head by raising the intake ports so the short turn into the bowl is at a better angle. They had 8. The. All made for regular gas. Sep 19, 2020 · I have a set of stock 1979 Pontiac 6X heads. Sep 3, 2009 · 400 motors actually have the potential to be very potoent motors. These were said to have a little over 8:1 CR. The 6X 4 would put your compression at around 10. 400) head 1967 No. This is our first aluminum Pontiac head casting that we have brought to the marketplace. 66" valves, 30/45 degree seats, threaded studs, 124cc ===== The 6X castings started being installed on engines after about 2/21/75 (cc's are factory reported, may actually be different) INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65-79 HEADS. Feb 25, 2014 · So i finally got my hands on a 78 Pontiac 400 unfortunalty its the ya code but i guess this would do. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. These measurements were from the deck surface of the head to the closest edge of the intake valve where it will be closest to the piston . I don’t have a basis for comparison in power but the 6X head combo plus a few small mods made it day and night compared to the 7. 66" on the 6X heads. 6 compression ratio. The 96's already have the 1. Bill Jan 3, 2013 · Pontiac engines have made good power/torque w/the compression ratios obtainable w/flat top pistons and the 400 chamber heads, like the 6X-4. There are many heads, other than multi dollar aluminum , that you could choose, depending on your budget and needs. 030" overbore if it was rebuilt. Compression Ratio and The Pontiac Engine. 039" thick head gasket, 4. bracket car. 4 to 1 compression heads that were on it before. -5I-6- 1975 455 4bbl 2. This is a 4-speed car with 3:31 rear gear with power Oct 9, 2003 · The 4X head was the 49-state casting used on all '73-74 400 and 455ci engines. I never had my 455 on a dyno but going by my weight and quarter mile speed/ET I estimate it was right at 450 HP. Our RaceKrafters modified 6X cylinder heads flowed 236 cfm at 0. 282 Jun 10, 2020 · If I remember the compression with the 6x heads came to 9. For a street engine that will run on pump gas you will need dished pistons to be 10:1 or lower cr. 4 to 1 vs over 10 to 1. Do you guys think should i leave the 6x and machine them down a bit for higher compression or go with the 17s. 023" deck height on 4. The D and N should have an arrow pointing to one, meaning they were cast on either the day or night shift. Sell the 6X-4 heads or save them for the 455 you really want to build later on. 8-10 to 1 compression. 5 to 1. Bill Jul 5, 2008 · 6x are the go-to performance pontiac head. 6X-4 heads w/FT pistons. The chambers were about 101cc. (IMO) There is a secondary code on them that needs to be found. 6X heads ('76 Pontiacs with the 455 engine) Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Stock Cast Iron D-Port Head Package. They made about 7. You see 6X heads all the time at swap meets and online. So do the 6X. Jan 1, 1999 · The 6X heads are popular and plentiful; most '76 to '79 350s and 400s had them as standard equipment. All very low compression. Jul 27, 2002 · The 6X heads will require less work as they already have the large intake valves in them. 3 or 9. By the time I had taken enough timing out of it for it to survive on 93, it was back to where it was with the stock 8. 120" bore and flat top pistons (no dome). Jul 5, 2008 · The 6X head will give you about 7. Dec 18, 2024 · Pontiac Cylinder Head 5. IN retrospect, I should have spent another grand and gotten aluminum aftermarket KRE's or Edelbrocks. were close to the specs Jan 15, 2007 · A set of 1970 #11 350 heads would be a perfect swap, milled for cleanup (I'd go . 061). #614/SR 0. Then again, it depends on which 4X and 6X, so check your casting numbers. 6 cc's for the valve reliefs, I come up with Nov 23, 2022 · Pontiac was really fond of the WT code and used it in multiple years. 4 cc chambers, but most heads have a few more cc's, so in calculating the compression ratio I went with 103 cc's. Pontiac Head ID These heads can be ported for optimum performance on a 450 HP street engine or a 700+ HP racing engine, and everything in between. Sep 22, 2008 · There are two versions of the 6X heads, 6X-4 and 6X-8 with the -4 being more desirable because of slightly smaller chambers. That's nearly a full point more and the cam for the higher compression engine needs to have close to 10 degrees more seat timing to maintain a safe margin for pump gas considering May 23, 2015 · The 6X-4 head is a very good head. Arguably one of Pontiac's most iconic cylinder heads, the 5. Having said that, they came in two different chamber sizes - big and huge to match the 455 cubes they were usually used on. 137 #670 0. Our Pontiac 6X heads for sale are meticulously to ensure top-notch quality. Aug 24, 2007 · The 670 / 16 type is a pretty good head and around 72cc chamber with screw in studs and 2. 6x-4 are 8. 68ragtop Dec 29, 2017 · However, your 4X heads should have 98cc chambers which will match the chamber size of the 6X with 100cc's if that is what is being offered. 7L 350ci V8 - 4X/6X Overview. Using a . 073 72cc E head 0. I assume a . Too high for a cast Iron headed motor. 43@103. 060" off the deck side and . Sep 3, 2009 · The 6x heads will bolt up to the 400 just fine. Jan 3, 2013 · Pontiac engines have made good power/torque w/the compression ratios obtainable w/flat top pistons and the 400 chamber heads, like the 6X-4. We were armed with a 400-cfm laminar flow element (powered by six 1. Head ID Location The following are 73-74 heads 4X-1H uses 4. 33@132 3595lbs Dec 23, 2021 · For you 6X guys the 6X-4 chamber is slightly smaller diameter as well as slightly shallower since it was originally a 350 head. I'm looking for suggestions on the valve job and some basic porting. The link below is to an extensive pontiac head chart. 030" overbore and typical flat top replacement pistons, we'd need heads with 82cc combustion chambers. The Exhaust valves are 1. 045" to keep the ignition parts alive longer. My heads were so hammered it cost about $1400 to re-do them. There are several sets of #15 heads on line right now. Don't believe me? Sep 23, 2006 · Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. 6X 4 heads are 94 CC chambers. 1972 LeMans 350 Pontiac H/S Drags project Jun 13, 2012 · 73 cc heads would produce a comp ratio of about 9. The big Pontiac heads hold up better than most other heads without hardened seats. to build a set of Stock Pontiac 6X heads that will flow 240 cfm and net you a pump gas friendly compression ratio you will need to spend about $1,500. For instance, you could take your heads off, increase the valve sizes and get the heads ported to flow more air. Jan 17, 2020 · The 6x-8 heads are said to have 100. 670 Worst exhaust-to-intake port ratio 1969-70 Ram Air V Worst intake-to exhaust ratio 1968 1/2 Ram Air II Biggest surprise Intake port, No. Good 400 CI engines are still available with some diligent searching. Jul 16, 2013 · The 6x-8 heads are low compression heads, they will work good on a 400 engine if prepped properly, larger exhaust valves, port work, etc. But for a street driver with todays piss gas (as you know), it won't cut it anymore, unfortunately. 050 is about the max (and if you do that there's nothing left for "later" if you need to rebuild the heads to square up/re-flatten the decks). The factory comp ratings were with all specs at minimal or nominal, so it sounds like you got the so-called 8. I'm porting a set of 6x-4 heads for my 473 build at the moment. Below are some popular heads and chamber sizes (always be sure to have yours checked before any milling). In the late '70's, they put 6x-8 heads on 400's. Found in muscle cars like the Pontiac Firebird and GTO, these heads are a favorite among hot-rodders and performance enthusiasts. It will spin the tires and have enough torque to put a grin on your mug and be reliable as long as you dont go to big on the cam and Jet the qJet properly. Mar 11, 2021 · If I mixed 93 and Turbo Blue it was happy, but it was a bitch to crank when it was hot (like a lot of Pontiac's with headers). 350-375hp is easily within reach, with unported 6x heads. 25:1. _____ Ultimate Pontiac Head Flows I think the main purpose would be the air flow comparison between the different heads. 8 compression. Feb 16, 2016 · I remember reading at some point in time Pontiac changed the valve angle used in their heads. Jul 25, 2019 · Pump gas friendly at 9. Jul 6, 2009 · Stock Pontiac Head Flow Head Casting Number: Year: Notes: Porting: Intake Lift: Intake Flow: Exhaust Lift: Exhaust Flow: Download Desktop Dyno 2000 . The . Jan 23, 2016 · If I us the 6X heads , I'll have 8. 2 compression where as the casting number 22 casting head is the casting number head that would have come on the 1965 285 hp 326 HO motor and would have had a factory stated 10. Jan 31, 2023 · I'm just finishing up a Pontiac 400 stroked to a 461. 881/4. Jan 25, 2013 · When it comes to cast-iron Pontiac cylinder heads, the Round-Ports are the fancy of every performance enthusiast, but the smog-era D-port (4X, 5C, and 6X) castings have proven a performance Oct 17, 2009 · The 6X head was mounted on the L-78 400 cubic inch displacement engines between 1977 through the final installment of 400 engines in 1979. Aug 24, 2017 · Best low-compression post-1972 head No. The low compression ratio makes it difficult to use those heads on a 400 CI engine and a high performance camshaft. 3 to 1 . 6x-8 are 7. 66" valves and pressed studs. Jun 11, 2012 · On Pontiac heads, . 0 compression ratio. 500 hp will be a challenge for a street engine. Check out the site Jules mentioned " Wallace Racing", lots of good info there. Listed as a 96cc head, the ones I have come across start life about 103cc's and are still about 101cc's after a light cleanup mill. The bore/stroke ratio of a 350 CI engine is terrible and the block cannot be bored enough to take advantage of the #62 heads that were designed for 400 CI engines. You could re-build the 4X heads (screw-in studs, bigger valves, 3-angle valve job) and save money - their potential is underrated. the engine now has the 6x heads, i found some #17 heads for a good price out of a 68 350. heads or aluminum aftermarket castings to make big power from your Pontiac. 1:1, not 8. Externally they are the same, so you should have no problems with compatability in that respect. 48 heads ('69 Firebird 400 and 350HO, GTO, Grand Prix, Bonneville, Catalina) No. 060 over 428) back in the late 70s and loved it. In our last issue, we began our foray into the world of airflow, as. May 7, 2021 · Good head with large valves and screw in studs from the factory. 33mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3. But if you want to make some power and cam the engine for making that power, the compression ratio of the 6X-4 heads and FT pistons are a killer combo. Also would like suggestions for a Hyd roller cam & lifter combo. Ultimate. 00! Off the shelf ready to bolt on aluminum d ports will cost you $2,075. Jun 12, 2015 · YES ! Swap the heads. 6X (1975-76 400/455 & 1977-79 Oct 25, 2022 · For a 400 build to 1hp/CID you don't need a lot of head flow. Jul 5, 2008 · 6x are the go-to performance pontiac head. The one downside is they have very large chambers, so on a 400 they will require domes or lots of milling to get anywhere close to a compression that would support 500 hp unless he want's to go forced induction, which would be a great idea with 6x. 99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13. Oct 23, 2020 · Forget the Edlbrock Intake and Carb their HP looser! Find a stock pontiac 4 barrel intake, its best for street and use a good stock Qjet best on street for a Pontiac. They have 96 CC chambers, 2. The heads have a casting date of K24 which would be November 2, 1964 making it a 1965 head, and I agree that the casting number says those heads were originally on a 326 engine. 114 cc heads are for low compression 455 engines. 060" or more, but that's just my preference, not saying it won't work. This head is available with initial flow numbers around 260 cfm! This heads comes as cast with a 65cc chamber, 74 and 85cc CNC'd chambers are available. 5. 015" (piston down in the hole) and 6. 685" installed height. 5 hp vacuum cleaner motors), two graduated vertical manometers to measure atmospheric pressure, an incline manometer to measure actual airflow, and a velocity probe. I don't have the head #s in front of me but i can look some up later if you want them. 6X heads are good heads. Different chamber volumes, some huge for 455 engines and some small for 350 cid. Jul 30, 2013 · With all due respect 6X-4 heads will work just fine on a 455 if the cam matches the required compression ratio. 005 dish piston if supercharging. Designed for 6. 6X(8) Heads (other numbers available, Upcharge May Apply) Most Pontiac nuts just go with the edelbrock casts, which you will make more power with, but the cost is around 1100$. Most want the smaller chamber for the 400 for a good CR. Did a bunch 67 / 16's for a pontiac builder. #48 or 64 heads are 87cc and would be much better horsepower on premium gas and not to much compression to cause detonation. Apr 23, 2011 · Shawn another welcome to FBN. 870" valves; 4X-1H are 455 head with 114cc, 2. Jan 29, 2020 · 4X H1 heads have a 112 CC chamber size and may or may not have screw in rocker studs. If I mixed 93 and Turbo Blue it was happy, but it was a bitch to crank when it was hot (like a lot of Pontiac's with headers). It was my daily driver so I had to make it run on 93. 50's in a 2,400 lbs. 6:1, so the #47's can't be 73 cc 83 cc heads on a 350, assuming . The only difference with pontiac blocks is the size of the bore and stroke, and main journals. D. Sep 5, 2022 · The 1970 #64 455 head is also 87 cc and has the big valves, but these are expensive and rare. 600-inch lift. Mahle forged pistons. 6 CR. Jun 5, 2010 · the 6x-4 is a smaller chambered head will rase your compression to 8. 500 lb ft of torque is doable. 030". The above figures assume 10 cc for . 400-500 hp is a lot to ask on 400 cubes in a factory head. Not even sure you could get there on factory heads, especially on an engine design that doesn't have modern tech like a roller cam, computer-aided port designs, and were made in the deepest depths of the smog era. There are two problems with them - the biggest one for a mild street performance application being that not only are they missing the end bolt holes on the exhaust flange, the material that's normally there that you could simply drill & tap on other heads isn't Jun 5, 2010 · the 6x-4 is a smaller chambered head will rase your compression to 8. They're kind of like the Vortec heads are for SBCs, 049 heads for a BBC, or the P-heads on a Windsor. I would play to the pontiac engines strength, which is torque. The builder reported good power with an aggressive hyd Consider this…. Your compression ratio will be better than with the stock 4x 114cc 455 heads and allow for a better selection in cam choices. Here are some ways of finding out and changing your compression ratio on Pontiac V8 engines. 00. Jan 14, 2008 · Sure, they have the smaller 1. com Nov 22, 2011 · All 6X heads in stock form have 2. On a Pontiac engine the compression ratio's were change by using different heads. Seat pressure was about 110 LBs, and I know that the installed height is about 1. Machined the spring pads for 1. On the 6x-4's, one can mill the head side . Mar 6, 2015 · 1978 T/A 463 Pontiac, KRE 74cc 300CFM D-ports, Howard's custom SFT, Nash Intake,QFT 950 E85 carb, TCI TH-350, 4200 converter 3. 045 gasket thickness, and 5cc valve reliefs, will produce 8. I have heard from many people that if its city driving, & occasionally highway use. 6:1 200 horse 455 I took out. See the chart for 6x heads with 2. I also have 670 heads but decided to use KRE D Port aluminum heads instead. Pontiac head ID chart Jul 11, 2024 · 6X heads are the go-to for a mild performance head on Pontiacs. I installed different heads, 72cc #12 ram air heads, same thing, although a hair better. 6X-4s or even 8s are a possibility. Used Butler for the crank and connecting rods. When opened up to the 1. I retarded the timing, ruining mileage, power, and causing hot running. 3:1 depending on the overbore of the engine and how far down the pistons are in the holes at TDC. 500-inch lift and 250 cfm at 0. The OP lives overseas, he's stuck w/the 4X 455 heads. 56", but when you knock them apart you can measure that. Aug 23, 2013 · Those are both cast onto the heads. See full list on wowmusclecars. 2-9. 050 will remove about 10 cc's from the chamber --- so on those 142's you can take them from 90 cc's down to 80 cc's, but on those 6x-8's you can only get them down to about 88 cc's. 010" if they clean up there) to a max of . 16 compression. . All modern production engines, and most aftermarket Pontiac cylinder heads, feature a fast-burn combustion chamber, which is easiest identified by its distinct heart-shaped appearance. Jun 23, 2013 · The 6x-4 heads are a good choice for a 455. Chart to mill Pontiac Cylinder Heads Pontiac made closed chambered heads until 1967. The only real difference between a 5C and 6X head is the casting number. 13 heads ('70 Trans Am, Firebird Formula, and GTO with the Ram Air III engine, automatic transmission) No. Since Pontiac offered the 400 2-barrel, the 400 4-barrel with both manual and automatic transmissions, and the 455 4 Original Pontiac cylinder heads contain a wedge-type combustion chamber that’s fully machined for a clean, consistent burn. Don't need the high dollar porting work most will try to sell you. 016 deck, . 3" bore diameter, deck height of . Oct 28, 2014 · So let me get this straight, go out and spend money on 6x-4 heads that will still need every Dollars worth of rework he would put into the 7 heads when just the cost of the 6x heads would pretty much cover a conversion to screw in rocker arm studs of which you would step up to new 7/16" studs with the 6 series heads also! In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads. 77 valves. No way will I mill Pontiac heads . Not a cheap adventure, but better than pulling a valve out. 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