Quote:
Originally Posted by Ace23
Following up on this. Per the Comp Cam Slip that is part of the motor build sheet the info below is listed. If this information makes since to you it makes you wonder why a camshaft such as this was used.
*Gross Valve Lift .576 Intake / .576 Exhaust
*Duration at .006 Valve Lift 314 Intake / 329 Exhaust
*At 112 Intake Center Line / Duration at .050 252 Intake / 262 Exhaust
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I'm not sure why it was used. Poor choice. That much duration in a hydraulic roller with a 427 inch engine will kill the bottom end and kill the top end too. As I said before, this is what all the fingers are pointing at, IMO.
Nothing wrong with the 112 LSA, BTW, it helps with vacuum and with making the curve broader, but that duration is just out of the ballpark. When you see advertised durations near 320-330 degrees, that's why your cranking compression is very low.....TONS of overlap and the intake valve is not closing until very late.
I have custom hydraulic rollers that I like to use for my 427's and as I mentioned before, you're about 12-14 degrees too high...