[eLeSthree]

Originally Posted by Bo White

I'm all for efficiency. More power with less boost.

I dropped 3 psi so far from the FED M311's.

Originally Posted by Tpeeler31

So after reading through the thread my thoughts are this: basically aftermarket heads are great but not necessarily cost effective when I could port the stockers, get similar gains, and come out cheaper (and that saved money would go towards FI). I know I will regret not doing heads because at the end of the day that will be power on the table that I passed up. Also from an efficiency standpoint, wouldn’t better flowing heads help make more power with less boost which in turn would be better for the block and heat? I believe I’ll port the stock heads, use the saved money towards boost, enjoy my gains in the meantime, and satisfy the power bug in me for the time being. For my scenario ported stock heads sound like the most satisfying option. Thank y’all for the time, valuable info, and helping me think this through!

I was going to mention efficiency. I ran 20#s of boost on a stock ls3 with a cam for a while. it made a bunch of power (about 950), but boost is a measure of restriction which is actually a negative thing. Sooner or later, I would have lifted a head, or cracked a piston. With the new setup (dart 427 FED M311 heads and cam), with the same pulleys I'm seeing 3-4psi less boost and can tell its making more power already. (breakin period)

I think your plan will work, but just remember one thing. If and when the boost bug bites, you might someday be regretting not having a 6 bolt head.

Those PRC as cast heads are 6 bolt, and will out flow a ported stocker. All depends on your goals i guess. Mine change everyday.