First off please give more info on your application. What car/engine/components/amount of boost your going with/your goals etc. It is pretty impossible to give answers without knowing the whole picture.
Second, are you sure on those head specs, they seem a little off.
Lastly this is not an advance question, i would move it to the proper forum exept i dont know where to move it since you didnt say what engine your working with...
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Ken Mook - 97' SS #2544
Advanced Tech Posting Guidelines- Almost Alive: ?rwhp & ?rwtq Naturally Aspirated on the Stock Bottom End.
- Stage 3 Pro Performance Heads, Solid Roller 242/248 Cam, Endur-X Lifters,
- Jet Hot Hooker LTs, True Dual 3" Exhaust with x-pipe, and the list goes on and on...