Quote:
Originally Posted by PAUL K
I think folks are missing the point of this thread. I don't think it's about whether a 455 can make power, I believe it's in regards to the effect of port volume on a combination.... But maybe I'm mistaken.
Anyone have any examples of port volume changes and it's effect on performance?
Anyone remember when Pete McCarthy ran faster with his small volume 670 heads than he did with the better flowing and bigger volume RAIV heads? Any thoughts if even bigger heads would've degraded his performance more?
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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.