Can anyone tell me the casting number off of a stock 1983 Z28 head? The car is in storage for the winter and I can't get to it all that easy. Stock LU5 Crossfire injection heads. Or better yet if anyone could tell me the valve sizes and other specs? Much appreciated

 

should be 14022601 casting with tiny 1.84"/1.5" valves, 58cc chambers

 

With larger intake valves installed, say 1.94, would these heads be a good candidate for a higher compression budget build 350? I know they're going to run out of steam, but for my application, mainly street performance, I have no need to make power over 5,000 RPMs.

 

Does anybody have any input or personal reviews?

 

58cc heads are too small to work well on a 350. youd have to run some deep dished pistons to keep the CR down. plus the valves are tiny, for $50 at a junk yard, you can get some stock heads with larger CC and bigger valves.

 

If you've got no need to go above 5000 RPMs and just want "street performance" then why are you building a high compression 350? 350 64cc heads and flat tops with the proper quench distance will have you right around 10:1, and with iron heads even 10:1 is as high as you'd want to go. Past that you need to run E85 or something or you'll have to pull out a ton of timing to keep it out of detonation.