my iroc has a 305 tpi in it now but I just got a 355 n im doin the swap soon n im using the tpi with the 355, im want to know what heads will make more power, the 305 heads or the 993 made in mexico heads, there 202 160 valves n I think 76 cc chamber, any helps appreciated.
thanks, justin

 

Just a tip here, but using proper punctuation and grammer sure goes along way at getting a response. It's knda lkie whnervr yuo see thsoe gofoy mssages wtih msesed up lettres. My mind is still reading it but at a slower pace.

Don't really see much advantage to using either head over the other. The 305 head might have a smaller chamber to net an increase in compression. But if the 355 is already assembled with the 993 head, I wouldn't waste anytime or gaskets with swapping to the 305 head. Is either head ported?