Complex sentence: Both blocks have a bore spacing of, almost exactly the same as the Lincoln Y-block, but the two blocks differ in deck height with the small-block having a deck height of, and the big-block having a deck height of.
Split into simpler sentences: Both blocks have a bore spacing of, almost exactly the same as the Lincoln Y-block. The two variations on the block differ in deck height, with the low-cost option having a deck height of, and the tall-deck version having a deck height of.