Quote:
Originally Posted by nachos14
Sealti, can you educate me of these. So these an upgrade to p11 head without any other changes? Sure I can look online but sure others wondering as well. Any info would be greatly appreciated.
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High lobes is the issue on anything but a 800+ BHP turbo. High duration and high overlap means lots of cylinder blow down prior to max fill/pressure. Simply the turbo isn't capable of filling the cylinder to max capacity during the power stroke which translates to a loss of pressure = loss of power.
In all honesty, P11 work for a majority of applications. Get P12 if you want 6-700HP. N1 cams for anything else above that.