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pontiac 400

This is a discussion on pontiac 400 within the Classic Muscle forums, part of the Vehicle Specific category; i have a 1977 trans am and it has a pontiac 400, i want to make some horse but im ...

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    Local Tire Smoker blackout5.3's Avatar
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    pontiac 400

    i have a 1977 trans am and it has a pontiac 400, i want to make some horse but im not going after a lot mid 350-370 maybe more i just want a cruiser.
    every one says stroke it, but seems no one wants to help with any suggestions i just want to get away from the base 215hp and take some of that 20,000flbs of torque turn to horse LOL. i already have a weiand action plus intake, headers and a holly 750. any suggestions wich cam and crank to choose, and modifications to the heads i need to make for the stroke? or if it is needed.

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    Senior Member snaggeltooth's Avatar
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    A good port and polish on the heads will do good . you have the Ram air cams . I say the 3 , the ram air 4 can make a few more horses but the 3 is smother .. Up your compression to 10 and you should be good to go ....

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    I have a 1970 Pontiac GTO with the 400 rated at 350 horse and mine got a nice little boost by adding roller rockers...

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    Local Tire Smoker blackout5.3's Avatar
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    thanks guys, i have toyed with the idea of roller rockers and wondered what they would do, but i got a little suprise today, i hadent recieved the 400 yet when i posted last night, and when i picked it up today and took it to a friends house he said it was a olds403 not a 400.

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    cameo white
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    just out of curiousity, is your trans am a automatic car?

    If you truly have a 403 in your hands, go on car crafts website and do some searching, over the past year I remember them doing something with the 403.
    quick 403 links
    realoldspower.com
    http://www.mondellotwister.com/Art403Olds.htm
    http://www.mondellotwister.com/ArtUnsungH.htm

    Car crafts street buildup of a pontiac 455, do same with 400.

    http://www.carcraft.com/techarticles/116_0306_pont/
    Last edited by jerry caesar; 07-27-2006 at 06:52 AM.

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    Senior Member Zboner's Avatar
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    im about to build a 400 with a friend here shortly when it gets out of the machine shop and back to him, get the casting numbers off the heads, i think the 6x heads are the best for the 400's if im not mistaken

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    there is an earlier head, which i cant think of off the top of my head, that has a smaller cc than the 6x, to bump compression on later low compression motors. But I have no idea what kind of 400 setup your going to do, stock pontiacs used flat top pistons and varied the compression with the combustion chamber design.

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    Senior Member Zboner's Avatar
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    i know ther compression is something stupid if your going to do a NA set up i think the 400's are like 7.5/1 or something or 8, but perfect for a supercharger!!!

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    Senior Member snaggeltooth's Avatar
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    if it is a 403 it will have the oil filler tube in the front of the engine Pontiacs fill through the valve covers

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    Part time Goofball 0to60n4.5's Avatar
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    A 403 is not nessasarily(sp) a bad thing . They make cams - heads - headers and such for them.

    I have a 10.5 to 1 CR , port fuel injected one in my 79' Cadillac Seville that runs pretty good.

    Back in the day - 20 years ago it was a fast 4 door. Now the factorys put out Sedans that will run circles around it.
    If it doesn't require Premium fuel ,You got the wrong Model.
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    94' LT1 VETTE
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    ABOUT 6 OTHER DAILY DRIVERS
    http://webpages.charter.net/pmcmolson/HOMESPAGE3.htm

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    Local Tire Smoker blackout5.3's Avatar
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    Quote Originally Posted by snaggeltooth View Post
    if it is a 403 it will have the oil filler tube in the front of the engine Pontiacs fill through the valve covers Click for full size

    lmao looks like mr car guiru was wrong, Gawd i look foward to telling him, but it deffinatally fills through the valve covers not through a tube.

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    Local Tire Smoker blackout5.3's Avatar
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    Quote Originally Posted by jerry caesar View Post
    just out of curiousity, is your trans am a automatic car?

    If you truly have a 403 in your hands, go on car crafts website and do some searching, over the past year I remember them doing something with the 403.
    quick 403 links
    realoldspower.com
    http://www.mondellotwister.com/Art403Olds.htm
    http://www.mondellotwister.com/ArtUnsungH.htm

    Car crafts street buildup of a pontiac 455, do same with 400.

    http://www.carcraft.com/techarticles/116_0306_pont/
    yes it is automatic, and im going back with a 700r4 so i will have OD for long hauls to shows

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    Local Tire Smoker blackout5.3's Avatar
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    Talking

    Quote Originally Posted by Zboner View Post
    im about to build a 400 with a friend here shortly when it gets out of the machine shop and back to him, get the casting numbers off the heads, i think the 6x heads are the best for the 400's if im not mistaken
    aight, let me know what you find out, im all about getting more out of less

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    Go look for older 400 heads like from pre-'72 and you
    will find 10:1ish compression, high 9:1s at least. But
    probably need to install hardened seats on older heads.
    Don't know about flow.

    Look at a BOP-pattern 200-4R as an alternative to
    the 700 series, simple and strong and a length match
    to a TH350. You don't need the dual pattern bell.
    Can find TV cable adaptors for most carbs.

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    your parts guy!!! 1fastcamarosss11's Avatar
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    if you go with the 7004r let me know soon i have an 2,400 stall brand new in box on ebay right now. will end early for 285.00 shipped. it is an b&m . one of the better stall. street friend with a little punch. pm me thanks jeremy

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    Senior Member snaggeltooth's Avatar
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    Quote Originally Posted by jimmyblue View Post
    Go look for older 400 heads like from pre-'72 and you
    will find 10:1ish compression, high 9:1s at least. But
    probably need to install hardened seats on older heads.
    Don't know about flow.

    Look at a BOP-pattern 200-4R as an alternative to
    the 700 series, simple and strong and a length match
    to a TH350. You don't need the dual pattern bell.
    Can find TV cable adaptors for most carbs.
    I would agree on the heads except for one thing. He already has a set of 6X and he will have to do a port and valve job on them..Otherwise he will have to find a good set of older heads and do the same thing......
    To find out your information all you have to do is pick up a current issue of High Performance Pontiac, there is always somebody asking the same question that you are and them guys know alot more about these things than we do .....

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    Local Tire Smoker blackout5.3's Avatar
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    hey thanks guys, you are a heap of help! if i had asked that sort of question at MM they would have had some sort of snotty answers and then turned that post into a how great my car is contest.

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    It might be easier and cheaper to find an Olds 455 and build from there.
    It will bolt right in.
    If indeed it is a 403 I wouldnt invest in any mods past an intake carb and headers.

  20. #20
    Member 05gtoautoX's Avatar
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    the 403s had a big problem with oiling, cam/valvetrain and they were cast with very thin cylinder bores, also as some of you know I'm very biased toward pontiac engines, they are torque monsters and are very well built, if you have a 403, swap in a poncho 400, it too will bolt right in with the exception of motor mounts, look for some 1968/69 #62,48, 16 heads, a good cam/RRs and a set of headers. now the other thing is you're looking at a 700R-4 well in stock for it'll handle about 300 ft. lbs. of torque. so you will need it built, als you can get an adapter to fit the B.O.P. bellhousing. but just remember a stock 400 with either of those heads had 440ft./lbs of torque not to mention with any other mods, if you do have a olds 403, and decide to swap in a 400 pontiac let me know and if you need to find one I'm sure I can find you one or you can buy one from me.

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