Intake manifold differences
I was wondering about different intake manifolds. My new 455 is nearing completion and my buddy wants me to use an Edelbrock Performer RPM. I have Edelbrock round port heads and am using a hydraulic roller cam. He says it should make in the mid 500's horsepower. I would like to make my plain jane Firebird into a Formula or Trans Am. Both of them, I am pretty sure will have clearance problems with the RPM manifold. I would love to have the Formula hood functional, if I go that route. Is the aluminum H.O. manifold equivalent flowing to the RPM? I have seen the testing that Jim Hand has done and others. How well did a SD manifold flow versus the H.O.? I know that the repo H.O. manifolds are known for core shift and need to be ported to optimize port flow. Is the benefit of that manifold worth it for a low 12 second street driver? I tried searching for answers but I could not find any comparisons. I thought I would ask someone here who may have already gone down that road.
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