76cc...and those heads are crack prone and not recommended for performance.
64 cc's
This head is a 305 HO head from 87-91 models and the chamber size is 58cc. Also, this head has 1.85/1.50 valves.
58.cc low torque swirl chamber head
stock 350 heads are 72 or 74 cc
Yes they both have 4 inch bores but if the chamber size where the valves is different it will change the compression.
Answer If you are checking # on a Chevy head they are under the valve covers in the rocker vally close to the center of the head . the # there can tell you when they were made and for what size engine and also the size of the ignition chamber also a good idea of of the size of the valves installed at the factory .they are cast into the side of the cylinder head,as the name may suggest
76cc
There is no Chevy 4.3 V8. The 4.3 is a V6 followed by a 4.8 V8
60cc
no the inside of the head will be a different size
No the head gaskets are dependent on bore size
Rather than grinding in the combustion chamber, which would lower the compression ratio, I would think there would be more to gain by working in the valve pocket. Especially the short-side radius and the bottom of the valve guide. Also, a good three-angle valve job can improve flow through the head.