cam degreeing kit?

More exhaust duration does help peek H.P. and let the motor has more power after its tuned RPM range. But most of the time low and mid range power will be lower. The motor may get less MPG too.

The intake manifold needs to be flowed with the head to see the ratio difference from intake to exhaust.

Best is to try both and see what happens. Heres a quote I copied from speedtalk...


I've had good luck with some street engines using single pattern cams. These are usually 550 hp type pump gas motors with full exhaust. What I've found in those applications is that extra exhaust duration just causes more problems than it solves. My guess is the back pressure from the exhaust system causes more problems on the bottom end of the torque curve than the extra duration solves on the top end.

I did some dyno testing a few years back and the best cam was a 40 year old single pattern design from Mopar Performance. It worked better than the whole box full of "new" cam designs that Comp sent me. All of the Comp designs were split pattern cams but none worked better than that old school Mopar cam.
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Andy Finkbeiner
AR Engineering