Quote: I wouldnt use these on a 5.7 block personally. How much power are you shooting for? The best head for all out turbo use IMO would be the Thitek's because of the thicker decks and better quality of material across the board. In a turbo application I think you would run out of sealing with any stock head before the Apaches would show a distinct power advantage.
However much power stock parts can handle lol...I have no interest in building a G3 hemi to only go and spend coin on Thitek heads. To me, the appeal of the hemi is how well the stock heads flow, both as cast and ported. Combine that with a good bottom end, and I can't see why 8-900hp isn't attainable.
I do want to stay 5.7 for blocks because of cost and availability....If the 6.4 head is really no good on that bore size, I will save my cash and put some work in to the stock 5.7 heads
I was replying to Mr.P. I'm not gonna tell someone to not try something without having done it myself. Will the Apache bolt on to a 5.7? Hell yes. Will you need a bore notch? I know I have read that you do. So what, for the price of these heads it is probably worth it compared to no heads at all im sure. They do need an intake that can be opened to their huge ports though. People have said the smaller heads have better velocity but at 8000rpm I bet it evens out.
