Originally Posted By: Rjonah
My question is, all other things being equal, is there advantage e.g better metallurgy, casting, design, etc. of using one block (1968 vs 1977) over the other?


The 230/250 blocks are the same in terms of dimensions - i.e. 3.875" bore. The added displacement comes from .28 additional stroke.

From my perspective - when dealing with blocks that are 40 to 50+ years old - it comes down to the individual block's potential not the age difference. Does the block magnaflux crack free? Given it mags OK, then how much room is left for boring/honing to true? If a particular block exhibits cast shifting then the less the over bore the better . . .

Whether the herd of '68 blocks is somehow better/inferior to the herd of '77 blocks seems irrelevant in my mind. You have two from which to choose from in your garage . . .