I have the 383 for my S10 sitting in the garage. It needs a tear down and hone to eliminate some rust from sitting. Anyway, the heads are nice and for a budget build they were THE choice for me. But I am sitting at 10.5+:1 right now. And I am considering throwing the engine in my C2500 pickup. If I do that, the compression is just too much. So I'm looking at what head options I have. So who makes heads that accept the Vortec intake and have a 72 or 76cc chamber volume? Only option I have found is AFR's 180cc street heads. In the end I think they are the best option anyway. If I am spending $1000 on heads, why not spend $1400 and just get the best right off the bat? The other thing is, what are the limits of the Vortec fuel system? I know the pintle injectors are only 19lb-hr, so thats not much fuel to feed a 383 with an LT4 Hot Cam and AFR heads. Think the intake/fuel system could handle that kind of power? I've heard it said before that a 383 with LT4 Hot Cam is basically the limit of what the system can handle. Thoughts? Don't know if there are any Vortec knowledgables here, just wondering if someone knows more on the system.