Intake Manifold and BBC Peanut OvalPort Head ?'s
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Intake Manifold and BBC Peanut OvalPort Head ?'s

  1. #1
    Senior Member SkyHarborCowboy's Avatar
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    Default Intake Manifold and BBC Peanut OvalPort Head ?'s

    What intake manifold do you guys use with a BBC 454 with Peanut Oval Port Heads? What is the Max RPM/HP with these heads and what would be a good cam to run? If replacement is recommended what heads should I look for?
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

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    Senior Member MACHINEHEAD1's Avatar
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    Weiand makes a nice alum. dual plane high rise that works pretty well. A comp cams magnum 280H would be as big as I would go with logs. The 292H only if you add headers of some sort, and a 850 cfm carb. Might get to 410-425HP with the last combo and some dyno time!

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    Senior Member CK7684's Avatar
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    Use those peanut ports as anchors and find a decent head first...

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Once you get above 3,500 to 4,000rpm, the peanuts will starve the top end off the motor, no matter what the intake or exhaust system is able to do. They are the "choke-point".

    Machinehead's advice is sound IMO, but, the setup is begging for a set of large oval ports to let the cam/intake work better.

    Unfortunately, unless you go aftermarket, the factory large ovals that are comon to find, usually come with the small valves in them (2.06/1.72"), and deserve the factory biig ones (2.19/1.88")
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    Senior Member CK7684's Avatar
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    You will probably kick yourself if you spend a bunch of money buying parts to work with peanut port heads and want more later. IMO, it would be worth upgrading the heads to something that will support more power later on. Some large oval ports with bigger valves would be a good place to start. Mine had rect ports stock...

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    Senior Member SkyHarborCowboy's Avatar
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    To be honest, what I am most curious about is the intake manifold. Is just using the stock Cast Iron one the only one there is or is there an aftermarket one available? I do have a set of 781 heads that I can get rebuilt but for now I just want to keep the engine as stock as possible and rebuild my other 454 engine when funds become available.

    Joe
    Thanks,

    Joe
    1988 Commander BBC454 Berkley JE-A with A-Impeller

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by SkyHarborCowboy View Post
    To be honest, what I am most curious about is the intake manifold. Is just using the stock Cast Iron one the only one there is or is there an aftermarket one available? I do have a set of 781 heads that I can get rebuilt but for now I just want to keep the engine as stock as possible and rebuild my other 454 engine when funds become available.

    Joe
    FWIW I recently pulled the top-end off my motor and did a cam, head and induction change. This would be the boat in my avatar. Before- 454,mild cam, peantus maximus heads, stock cast manifold with a spread bore 650 holley and the best I saw was 4800 rpm. I don't think for the combo was to bad! GPS low 70's. New set-up- custom cam, 781 heads with alot of work and good spring pressure, Weiand T/R with a pair of 660 holleys and the net result would be 1K more rpm and radar at mid 80's. Yes the pump is tight and the underwater hardware works well for the boat. M

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