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Re: Head Porting Question
Crower springs and retainers should hold 280s and the revlimit your looking at. The problem with the crower springs is seat pressure, with the more crazy lifts and ramp rates of the big big cams plus high revs you need 280+lbs of spring pressure(pending cam choice), I think the crower gets up to ~190 lbs with a .400" lift, so dual valve springs is the way to get the spring pressure needed for the big big cams. Its good to know comp and fp are the same. I like how easy it is to see the info on FP's site about the cams, and they are a good price.
~John
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Moon taxi: 9.45@156.9 mph 41psi 2011... Letting people down sense 2012.
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