I was not referring to factory stock block....Just looking at somthing to see which way a person would build an engine to a cube inch limit for max power NA....The over riding response seems to be the biggest bore you can get.
Since stock block overbore is limited to 4.400 or less, i assume most of us figured on aftermarket blocks. The best combo might be a 4.560 bore 4.25 stroke for 555 cubes. But not many want to take a good block to the limit if they don't have to.
I became a believer in big bores when my first megablock combo went 8.70s at 3055 lbs with 440-1 heads, and 13.4 compression. 528 cubes, 4.15 stroke 4.50 bore. Cam was only 280/290 @ .050 and .760 lift
