Thread: Ragged Edge Pro-Street 406

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Originally posted by pat mccarthy
turn up the cr or turn down the cam a bit ??

Going by a dynamic compression calculator, I'm at 8.01 effective compression. The max on pump gas is supposed to be 8.4. If I shorten the cam to 305 with the same tight LSA, it will put me at 8.35 which may be better. The engine is still on drawing board so change is not out the question. I do want to stay with flattops as they produce more power.

I think turning down the cam to a 305 seat timing will be a good move. A little closer to the edge, but a tight quench should help things out.

Here's one: 306/316, 270/278, .630/.630, 104 LSA

I think this one will make more power and torque. I like those Comp hi-tech 420 lobes. They don't beat your valve train up too bad.

I could shorten that Ex. to 312/274 or make it more of a single pattern at 308/270 but running through the mufflers, I may need that extra bit of blowdown.