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Edit: new pic- look at these BBC heads

Discussion in 'The Garage' started by tiger9297, Aug 26, 2006.

  1. tiger9297

    tiger9297 1/2 ton status

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    The heads on the right are the heads off my Gen V 454. Moretec.com lists them as "oval" ports. However, I have also seen them listed as "peanut" port heads. I set them side by side with an older Mark IV "236" casting which I know is for sure an "oval" port.

    Side Note: the casting number on my heads is 10114156

    DSC00053.JPG

    DSC00054.JPG

    My questions is, if you want to go with something other than the stock TBI and intake what options do I have? I'd like to go with the Howell MPFI unit, but if it's designed to work with true oval ports and mine are the peanut ports then they won't match.

    DSC00047.JPG

    DSC00053.JPG

    DSC00054.JPG
     
    Last edited: Aug 27, 2006
  2. b454rat

    b454rat 1/2 ton status Premium Member

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    I'm not up on what Gen is what, but years were the Gen 5s?? But what they mean by oval and peanut ports are the intake, not the exhaust.
     
  3. tiger9297

    tiger9297 1/2 ton status

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    The Mark IV go through '90; the Gen V is '91-'95; the Gen VI is '96-?.
     
  4. tiger9297

    tiger9297 1/2 ton status

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    Yes, I posted the wrong pic and I can't get my camera to cooporate. My 10 month old pulled it off on the floor the other day and it's been a little "off" since then.
     
  5. tiger9297

    tiger9297 1/2 ton status

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    Finally got the pic off the camera. May too dark though.

    DSC00051.JPG

    DSC00051.JPG
     
  6. b454rat

    b454rat 1/2 ton status Premium Member

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    Too dark, can't see anything.
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Get a much lighter pic and i'll tell you what you have. There are 3 different size ports for the most part. There is a peanut port or small oval, a large oval and a rectangle port. The peanut ports were used on trucks only, most passenger car heads were large oval and the rectangle ports were the LS6 and LS7 BBC used in Vettes and camaros. The later version of rectangle port heads were only used on crate engines as far as i know.
     
  8. k20

    k20 3/4 ton status

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    Ok, I just cranked my monitor brightness all the way up, and those appear to be the small oval ports, as they appear to be nearly round. Like others said, post up a lighter pic, just to be sure.
     
  9. sweetk30

    sweetk30 professional hooker Premium Member

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    full round is penut port.

    oval with round corners is oval port.

    square port with sharp corners is rectangle ports.


    if the heads came off a tbi or mid 80s and up mostlikly penut ports.
     
  10. tiger9297

    tiger9297 1/2 ton status

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  11. k20

    k20 3/4 ton status

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    yeh those are round peanuts
     
  12. tiger9297

    tiger9297 1/2 ton status

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    so will an intake designed for oval ports work?

    If not what options will I have?

    Seeing as how this engine will probably never see more than 4k-5k RPM would the stock TBI and intake do as well as anything else?

    I need some opinions on this one.
     
  13. k20

    k20 3/4 ton status

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    well, as we've talked about in PM's, the edelbrock TBI-MPFI conversion, is made for the peanut port heads. That would probably be the quickest, simplest, and cheapest way to get it going. A true oval port manifold, would work in the sense that it would, but stepping down to the peanut port runners in the heads would be a major restriction on it, and would probably screw up the spray pattern from the injectors.
     
  14. b454rat

    b454rat 1/2 ton status Premium Member

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    I just lost my train of thought, but you could use the peanut style intake on the oval heads, but not the other way around. There will be a wall were the surfaces dont' line up. Motor would probly run like crap. I was told that you couldn't run oval port heads on a TBI motor, the TBI won't be able to keep up with the flow of the intake/heads. I guess if you get a bigger fuel system, you could get it to work. But I think even with a big inch BB, your not gonna be able to get high Rs with it, so I would think that it would work.....
     

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