[lust4speed]

The second seven looks a little strange, but thinking it has to be a 1977 block. Date code reads D067 and the front letter code is WA which would fit. Didn't have any luck in getting other casting codes. Would this be one of the few non-557 blocks?

[Sirrotica]

Originally Posted by lust4speed

The second seven looks a little strange, but thinking it has to be a 1977 block. Date code reads D067 and the front letter code is WA which would fit. Didn't have any luck in getting other casting codes. Would this be one of the few non-557 blocks?

Mick, if it's a 77 block it should only have 3 motor mount holes, (late style mounts) they did away with the 5 hole universal motor mount setup in 77. 76 was supposed to be the last year for blocks with 5 holes per side. But with anything Pontiac, there can be exceptions to the rule.

[Jay S]

It should be a 557. The heavier XX block 4 speed F body has a WC code for 78, 77 4 speed was WA and were 557 blocks.