sr20fd3st

From what I can understand, the current GM perf. parts ZZ4 heads you can buy are the same cast as the L98 corvette aluminum heads (correct me if im wrong) I was looking to buy either some used ZZ4's or used Aluminum L98 heads. I think i remember the only difference being the ZZ4 heads had stronger valves (or lighter ones) and some other parts maybe that came on assembled heads, but the casts are identicle. those suckers with their 58cc combustion chamber (i think) would help my lame 8.2:1 compression L-81 motor out alot!!

Thanks,
Oliver