Isky 270 Mega Cam P/N 390171

ir3333 said

i think the numbers were 436 / 487 for the header tests. I know there are no cam numbers but around 20 hp/tq loss doesn't seem like a lot.
...and then you have to run it through 20 feet of exhaust pipe and mufflers. Headers may not be worth the trouble on the street. America al just doesn't like headers and that's ok.

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It is ok. My point was if the cam was ground for exhaust manifolds (which it should have been because that's what the customer wants) then the headers would be at a decided disadvantage. I think the gain/loss would have been greater if the cam were ground for headers. You could (theoretically) use cam timing with a tighter LSA and the intake lobe could open later and faster with the headers and make even more power.