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The chambers are 60cc. The heads are from 77-78 307 engine.
A Chevy 327 cubic inch engine is the equivalent to 5.3 liters. This is the size of the combustion chambers in the cylinders.
60cc
stock 350 heads are 72 or 74 cc
The combustion chamber size of the heads with the casting number 376450 is 60cc. It is possible to install larger valves.
You will need to have the heads for the 305 bored out to the same size as the 350. I disagree: you can use the 305 heads on the 350 block but you will increase compression as the 305 heads have a smaller combustion chamber. The critical dimension is valve clearance. If compression ratio is a critical consideration, different pistons may be available which will bring the combustion chamber back to size. the 305 is from the 3.671 inch bore family. The 350 is from the 4.00 inch bore family. All small block heads have the same bolt pattern.
Should be 74cc
Yes you can. Be wary that if there is much of a difference in combustion chamber size you will be affecting the compression ratio. As an example, most of the 350's in 1975 had the 76 cc chambers. If you put a set of 58cc heads on that block, your compression ratio would go from about 8.5:1 up to something north of 10:1. This would make more horsepower, but is not pump gas friendly.
The only difference between the two Chevy heads is the size of valve they were designed to fit. Either size will work correctly on all valves, though.
There is no Chevy 4.3 V8. The 4.3 is a V6 followed by a 4.8 V8
The difference is in the size of the engine. Specifically in the intake and exhaust ports. The bore and stroke of the crank and pistons and the size of the combustion chambers.
No. The bore size is different between a 305 and 350. The 350 bore size is larger.