Thread: Wanting to give my 460 some pep!!

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I forgot a question for Techinspecter. The ratio of runner+plenum to displacement is what I was alluding to. I believe that ratio is a little bit more favorable in big-block applications, but I could be wrong. Do you have any info or an opinion on that? I havn't measured it, but just I've based that mainly on the plenum area being restricted to the size of the carb base. That said, you can always raise the floor on the intake, and I know there's one out there that used to have interchangeable floorplates.

You know we never addressed cam profiles. There are a dizzying number of cams out there. My advice is don't order out of a catalog until you consult with a cam manufacturer. Don't feel comfortable unless they ask all the right questions, like rearend ratio, tire size, converter stall, etc. Try and lay out exactly how you want it to perform before you make the call so they have the right info to work with. That'll get you a cam you can live with.

Originally Posted by moparfever

I forgot a question for Techinspecter. The ratio of runner+plenum to displacement is what I was alluding to. I believe that ratio is a little bit more favorable in big-block applications, but I could be wrong. Do you have any info or an opinion on that? I havn't measured it, but just I've based that mainly on the plenum area being restricted to the size of the carb base. That said, you can always raise the floor on the intake, and I know there's one out there that used to have interchangeable floorplates.

I have thought for years that the manufacturers should pour their manifolds and tell us the volume that any one cylinder would "see" when the intake valve opens, (100% of a 360 intake, 50% of a 180 intake). In my opinion, it would take a lot of the guessing out of the game for those of us who can't dyno every combination. We put a lot of stock into cylinder head runner volumes, why not manifold volumes?