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I have been told for my use a car that is heavy and a 4spd with a 354 gear and fairly mild compression not to go more than 260+ in duration. It will keep the torque down low where it is usable on the street and the fact that I am not spinning it above 6000 rpm. I also only have 10.1 comp and was told that is a consideration in running a larger cam.
Every thing you mention says go short on duration! Heavy, very low compression, 6,000 rpm. If Duane spec'd the cam, don't look back.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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