Quote:
Originally Posted by CrazyInBlack
or swap the heads and get more than a PI
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Full PI swap is definitely better if you are keeping it stock. Ported NPI heads perform just as well as ported PI heads though. The increase in power you get from STOCK PI heads is maybe 10 HP and that is due to the compression increase you get.
NPI heads do not flow bad at all. Just PI cams and PI intake swap you will pick up close to 40 HP and your power curve is MUCH better. Where the NPI intake chokes off around 4500 rpm's, the PI intake will pull all the way to 6500 rpm's no problem.