[ShizzySupra]

Originally Posted by ramairroughneck

I regret doing heads on my combo. I would have been so much better off to have put that money into the fuel system. Is there really an advantage to gaining power by bolting on heads when one size smaller blower pulley puts you at the same exact power?

The bigger power gain comes from milling the heads. The porting helps but for the most part will just help the upper end curve on most setups. For example I gained 40ish whp peak on my setup but it was 55+whp in the upper end past 6400.

There also comes a point where pulleying down is generating more heat than its worth for power gains.