First Generation Firebird-L Mailing List ......................................................................... http://www.classicpontiac.org/FAQ.asp?myPage=V8HeadInfo
There were two "46" cashing heads that year. One version has 1.96/1.66 valves, and the other has 2.11/1.66. For a 400 or 455, you really want to make sure you have the 2.11/1.66. Then take it to your engine shop and have the exhaust enlarged to 1.77. This head's bigger 89-98cc chambers will be a good head on a 400 that will run all day long on 87 octane, since it will yield you about 8.7:1. I run 6X-4 on my 400 which is essentially the same as a 2.11/1.66 "46". There is plenty of power for my cruiser car. I turn low 15's in the quarter, and that is on 3.23 gears and a overdrive transmission. I also get almost 20 mpg on the road with my 400. On a 455, this same head will turn into much more of a beast. The compression again goes up, and it would be a good choice for a powerful cam. I don't know about putting a blower on a 350, never done it. If the compression ratio is right, it would work fine I'm sure. But make sure your bottom end can handle the boost. Thomas -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Saturday, August 08, 2009 8:39 PM To: [email protected] Subject: [FGF] Heads First Generation Firebird-L Mailing List ......................................................................... I just purchased a 1970, 350 motor with 1973-74 # 46 large valve, screw in?stud heads that were designed 1974 GTO 350, motor.??????? The #46?are rated at 7.6 cr with 89 cc when applied to the 1974, 350.?????The 1970 GTO 455 motor with large valve #64 heads were 87cc.???? My question, does anyone know whether or not these #46 heads can be used on a 400 or 455 blocks effectively.???? Can the #46 heads be used effectively on a 350 block with a blower set up, seeing as how the c.r. is only 7.6. Not sure if the?#46?heads were used in any other application other than the 1974 GTO. -----Original Message----- From: [email protected] To: [email protected] Sent: Fri, Aug 7, 2009 6:37 pm Subject: Re: [FGF] seat extensions First Generation Firebird-L Mailing List ......................................................................... my mistake, Bill Edmunds.. ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[email protected]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/> ________________________________________________________________________ Email message sent from CompuServe - visit us today at http://www.cs.com ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[email protected]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/> ------------------------------------------------------------------------ Submissions to Firebird-L: <[email protected]> Unsubscribe from Firebird-L: <[email protected]> Help: <http://FirstGenFirebird.org/firebird/Firebird-L.html> Classifieds: <http://FirstGenFirebird.org/ubb/> Owner Pictures: <http://FirstGenFirebird.org/show/>
