[b-man]

Don’t bore your block to the maximum oversize unless it’s warranted because of bore wear. Cylinder thickness is more important than going another .020” or .030” in bore size which really buys you only a few extra cubic inches.

To go big in this instance the best way is to replace the 4.00” stroke 428 crank with a 4.21” stroke 455 crank or perhaps a 4.25” aftermarket crank.

Boring your 428 to the max while keeping the stock 4.00” crank gets you 440 cubic inches at most at .060” over, so only 12 cubes gained by maxing out the bore.

Going to the 455 crank gets you 455 cubes at a reasonable .030” bore or 462 at .060” over on a 428 block.

Again I would never bore any block to the maximum size unless absolutely necessary.