340 Block Deck Height

Deck height is definitely going to vary a bit on production tolerances. When I had my '71 318 square decked the right hand deck was taller than the left, and both had to come down to be trued up.

But unlike the 318's, or even the later 340's, the early 340 pistons put the piston over the deck. Spec was .018" proud of the deck. Surprisingly enough, on my '68 340 I found all of my pistons to be around .017-.018" above the deck.