[Question] Porting oval to rectangular BBC manifold???
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Porting oval to rectangular BBC manifold???

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    Senior Member orange bahner's Avatar
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    Default Porting oval to rectangular BBC manifold???

    I am looking at an Edelbrock #7115 Tunnel Ram manifold. It comes in oval port and I have Rectangular port heads. For the most part the runners look pretty close to the same except at the ports would I loose anything using if I port match the manifold to the heads?
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    steelcomp was here
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    Waste of time.
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    Senior Member orange bahner's Avatar
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    Quote Originally Posted by steelcomp View Post
    Waste of time.
    Can I ask why? Would I be better off installing it the way it is?
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    steelcomp was here
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    Quote Originally Posted by orange bahner View Post
    Can I ask why? Would I be better off installing it the way it is?
    How big is the engine and what rpm are you wanting to run?
    For any real benefit you'd have to port the entire runner all the way to the plenum and honestly, I don't think there's enough material in the oval port runners to do that. That's a ton of work, and so is just matching the ports- for no gain. The port mismatch isn't going to hurt anything.
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    Senior Member orange bahner's Avatar
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    Quote Originally Posted by steelcomp View Post
    How big is the engine and what rpm are you wanting to run?
    For any real benefit you'd have to port the entire runner all the way to the plenum and honestly, I don't think there's enough material in the oval port runners to do that. That's a ton of work, and so is just matching the ports- for no gain. The port mismatch isn't going to hurt anything.
    Thank you. It is a 468ci. only looking to run about 6k rpm. I am currently running a 850 holley on a victor.
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    Senior Member puppyjp's Avatar
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    I didn't think you could run an oval port intake on rect. port heads at all.

    I know you can run a rect. port intake on oval port head tho.

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    Senior Member Bubbletop409's Avatar
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    Quote Originally Posted by puppyjp View Post

    I know you can run a rect. port intake on oval port head tho.
    I allways thought it would work better the other way around, oval manifold to rect. head?
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    Quote Originally Posted by puppyjp View Post
    I didn't think you could run an oval port intake on rect. port heads at all.

    I know you can run a rect. port intake on oval port head tho.
    I think you may be right.
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    Senior Member earlbrown's Avatar
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    Back when I tried it, my oval intake wouldn't completely cover the rectangle ports. Would have had a slight vacuum leak

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    gn7
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    Quote Originally Posted by earlbrown View Post
    Back when I tried it, my oval intake wouldn't completely cover the rectangle ports. Would have had a slight vacuum leak
    Depends on the manifold. Its very common to run a Dart oval port manifold single plane on rect heads. Also very common to run the Dart 4150 manifold with an adaptor to fit a dominator as well.

    But you could very well be right about a Edelbrock T ram not having enough flange to seal off the rect heads.



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    Here's what i think you're talking about, was watching this on ebay a while back, an oval port Street Ram ported out for Rectangular Ports.

    I didn't buy it so can't tell you anything more

    hope this helps

    Grayson
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    gn7
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    Just guessing based on the pics, if that thing was based around the Eddy roval ports, that thing took a boat load of grinding to raise the ports. The rovals are are considerably lower than the roof of the rect. It looks like it would work, but way more effort than I would be willing to undertake considering there are other choices out there.



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    Senior Member Bubbletop409's Avatar
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    Quote Originally Posted by earlbrown View Post
    Back when I tried it, my oval intake wouldn't completely cover the rectangle ports. Would have had a slight vacuum leak

    I didn't think about that apsect, I was just thinking going from a small port to a larger made more sense, than a large manifold to a small port.
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    Senior Member jimclauss's Avatar
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    Quote Originally Posted by steelcomp View Post
    I think you may be right.
    he is, in most cases
    Last edited by jimclauss; 08-09-2012 at 09:14 PM.

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