Quote:
Originally Posted by Jay S
I think your thinking is exactly correct. I tend to think there are changes which could be made to overcome the port volume when it has a negative effect on performance. But they are not always obvious.
This port volume debate is not just with Pontiac’s. The same things like you describe with McCarthy frequently happen on BBC combos too. BBC heads have Rectangle, Oval, Peanut port, and the modern Roval. Sometimes the smaller port volume goes faster. Especially on the Rectangle to the Roval.
BB Mopar is the same way. Max wedge versus a standard port window the 30cc bigger Max wedge does not pick up as much HP as you would expect just by going by flow numbers.
|
I agree and thanks, just trying to pass on free knowledge that will help an enthusiast make better choices.
Quote:
Originally Posted by Jay S
Pump gas combo that had a heads swap from stock E heads with minor port work to stock KRE high ports, close to the same compression, same cam. The car ran the same ET and MPH after the head swap, 11 flat. A couple cam changes and still ran the same times. Eventually the heads were milled and retarded the cam timing to get down to the mid to upper 10s.
|
Thanks that's a good example. Seldom do I see Hi-ports offer an advantage over a nice pair of Edelbrock heads on factory block builds.