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usually the mininum the block is bored to clean it up in .030 over..
302, 327, 350, 383 are 4in bore motors
377,400 and up are 4.125 bore
a 307 is 3.85ish and a 305 is 3.75...
the 4in or larger bore motors have wider cylinders allowing one to use larger valves and thus move more air and fuel therefore allowing more horsepower..
remember bore is the distance across the piston and stroke is the distance the piston moves up and down.
the 305 isnt a bad platform and all kinds of people run all kinds of times with them but dollar for dollar if your going to build a motor from scratch you money would be better spent on a larger cubic inch motor..
now lets hear the 305-350 debate..
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