Around 375
400 hp give or take..my friend has a machine shop and has very good luck with pro comp heads..
64cc is 0.064L
If you're talking about a stock compression short block that came with 58cc heads, the old 64cc double hump heads would lower the compression ratio and make less hp.
Higher compression ration which can increase hp. I installed 49cc heads on my 305 instead of the 64cc and got a higher compression ration and a fair amount of hp gain.
64cc
If the oil and water galleys match up, and it bolts to the block fine you should be good. You will probably get a very high compression ratio from this set up.. I had a small block .305 and I switched out the stock 64cc heads for a pair of 49cc heads I got a much higher compression and gain in hp. You really need to analyze the heads and block in question and surf the forums for a better answer.
64cc = 64 mL
64cc
Nothing needs to be done to make them fit. The only problem you would have is the compression of the engine. Anything larger than a 64cc combustion chamber will lower your compression quite a bit. Do some research and find the small chamber heads or look into having a set milled to spec.
The combustion chamber size of a Chevy 350 stock head typically ranges from 64cc to 76cc, depending on the specific cylinder head casting.
Yes, but it will drop the compression a little (64cc vs. 58cc chambers), and the bigger valves will make more top end at the expense of some low end torque. Also, if they really are camel hump heads (never heard of camel hump heads with anything other than 2.02, 1.60 valves)they may not have accessory holes drilled in the ends. It's probably not an upgrade.