Thread: Intake swap

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NTF, do you know what the port size is on the offy 360? I bid on one on ebay then got to thinking the ports may be too big for my heads same as the typhoon.

Originally Posted by TomJ

NTF, do you know what the port size is on the offy 360? I bid on one on ebay then got to thinking the ports may be too big for my heads same as the typhoon.

I'm not sure and I can't get to the one I have in the garage, but suffice it to say that the only thing that will fit your heads exactly are heads from the era. I doubt that the exhaust ports line up exactly with your headers either. I wouldn't worry too much about the ports lining up since it won't make that much difference with what you expect of the engine. There is only so much that can be designed into a mass produced intake manifold and IMHO Offenhauser came upon the optimum design in the 360º years ago and everyone else has been copying since. I wouldn't think twice about dropping one on your heads with no more than a Holley 600 with no more than 62 jets in the primary, probably smaller, and no more than 64's in the secondary.