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pontiac 400

This is a discussion on pontiac 400 within the Classic Muscle forums, part of the Vehicle Specific category; ...

  1. #21
    Junior Member
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    Garden Grove CA
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    Indigo Blue
    2000 ext. cab Silverado

    You still workin on this build up? 400 is an easy build up to get that kinda power. The factory basically did all the work for you.
    Its not that 6x are the best heads its that they are the easiest to find when your out junkin. Basically a simple cleanup on the bowls and port openings will help you out, as far as the rest go with about a 9.5 to 1 ratio with what ever cc head you use and then pick a cam

    Any dual pattern cam with about a 112 lobe center would work good. You dont want to go past 110 on the pontiac motors on the street. Probally comp cams XE274H would work good for a street package. I know of another cam but I cant find the specs as it was a project I was building a few years back.

    HYDRAULIC-High performance street, very Hyd. Hyd. 1800 to 6000
    51-224-4 XE274H 274 286 230 236@.050 .488 .491 at 110

    I was gonna use the same basic package block and head package but with a chet herbert cam, a single plane intake, and an offset ground factoy crank for 6.8 chevy rods to make about 500+ horse. Rollor Rockers and good qualty locks are a must on pontiacs ! Same with using a windage tray!

    Oh and I know some one is gonna ask about that crank set up. Basically it optimises your rod to stroke ratio and after market bbc rods are usually cheaper then pontiacs although in the past 5 years thats changed. Now eagle makes a crank thats already cut like that for bbc 6.8 rods for about $350 and with every one selling rods like the eagle h beam ones you can pick up a set for around 300-350! and as far as the pistons i think you can get trw's for that type of package but I know for sure ross has an of the shelf piston set up for that package. For what your doing you dont really need to do the offset stroker set up.

    You should easily make about 400 horse with out doing that.

    Pete McCarthy has a good book with a lot of basic info called "Pontiac Musclecar Performance 1955-1979" Other then that all I can say is hit up the true pontiac Guru's like Jim Butlers - www.jbp-pontiac.com, Rock and Roll Engineering - www.pontiacpower.com, sdperformance - www.sdperformance.com just to name a few.
    The guys at SD were pretty friendly and knowledgeable back when I talked to them but that was a few years back.
    Good luck

  2. #22
    Junior Member
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    Nov 2005
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    El Paso, Tx. (for work)
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    Quick Silver
    2001 Corvette Z06

    If I'm not mistaken, compression in a 71 firebird 400 was 8.2/1 so it is pretty low, but that is good for me. I'm trying to rebuild and forge for some kinda forced induction setup. Still looking into it @ this point.

    Good luck... and nice car.
    07' Lexus IS350. Saving up for a C6 Z.
    01' Quick Silver Z06. <-- SOLD!
    71' Galaxy Silver Metallic Firebird 400 4 speed. <-- SOLD!
    06' Civic Coupe. <-- SOLD!
    See pics

  3. #23
    Local Tire Smoker blackout5.3's Avatar
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    Black
    01 Silverado

    i stoped working on that buildup, it was magnafluxed and found to have spider cracks all over the mains.. so im looking for a late 60s poncho OR go with that 383 stroker..

  4. #24
    your parts guy!!! 1fastcamarosss11's Avatar
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    11,376

    trans am 00 ws6
    1998 camaro ss vert

    i have a complete 350 with everything brand new. let me know if interested, the block is out of an 70's truck.

    all parts still in original summit boxes with receipts.

  5. #25
    Local Tire Smoker blackout5.3's Avatar
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    Black
    01 Silverado

    well the guy thats doin it for me, can get a 383 stroked and lower end complete cheap, all i have to do is add heads, cam, intake, and they will still back it up with a 2 year warranty

  6. #26
    your parts guy!!! 1fastcamarosss11's Avatar
    Join Date
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    cleveland ohio
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    11,376

    trans am 00 ws6
    1998 camaro ss vert

    let me know what you need i have it all new in boxes.

  7. #27
    Local Tire Smoker blackout5.3's Avatar
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    Black
    01 Silverado

    saweeeet! cheap i hope LOL

  8. #28
    Member 05gtoautoX's Avatar
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    riverton
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    556

    Impulse Blue
    2006 Pontiac G.T.O.

    check out ebay, they have quire a few poncho motors on there, if possible stick a 428 or 455 in there, If you like torque, if NOT then go with a SBC 383
    2006 impulse blue G.T.O
    Iron Block 408
    Cam
    Pacesetter ceramic coated L.T.s
    LMII exhaust
    K&N CAI
    Ported TB
    Custom Tune
    FAST 90
    ZEX 125hp wet shot

  9. #29
    Member 05gtoautoX's Avatar
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    Impulse Blue
    2006 Pontiac G.T.O.

    OH BTW, a 428-455 have the exact same dimensions as a 400, and will bolt right in.

  10. #30
    Junior Member
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    Lewiston, Idaho
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    red
    73 Z28

    Step one: remove smog cam

    Step two: see how far you can throw it

    Step three: replace with any decent cam, Crane has a nice RA replica.

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