Been doing research on 049 heads for months now. Most of what I've seen is good. People claiming well into the 500hp range, even 600. I was told recently by a local engine builder that 525hp is prob my max. He would install a large intake valve maybe some porting but that's pretty much it. Is it possible someone with several years experience building engines isnt familiar with 049 heads. Current set up: 454 30 over assuming 10:1 (some work was done to motor not 100% sure) Trw forged pistons (again assuming domed to get that but not sure) 232 .562 lift cam (planned on going bigger) Eddy air gap intake Holley dp 800 Cast crank so thinking 5500rpm is prob my limit What are some opinions of the heads in question? Looking for 550hp minimum. Can I get that staying at 5500? Go to aluminum? All opinions welcome. Thanks.