1967 427 4 Bolt Block Stamping
 

I wanted to see if I can get an opinion of a front block stamping from a 1967 4 bolt 427 block. This block is a 3904351 I believe is dated H-25-6 and the front pad numbers don't make any sense to me but I did not want to get it decked. I just wanted people's opinion in case I am not aware of some different stamping. It is stamped T03067AD DA94I.

In my experience, a suffix with a number followed by 2 letters is usually a marine application.


Jasonn

7AD: Marine 67 427 390 HP RPO L36
Carburetion: Single 4 Barrel
Rotation: Normal
Description: Daytona

OK this is a four bolt block and has the reliefs cut out at the top of the cylinders which I always thought on the 427 and 454 if they were 2 bolt blocks the reliefs were not cut out?

It could be like the sbc pick-up trucks, low horse 010 block. They still used a 4 bolt main. Marine app maybe received the 4 bolt too, even lower horse, because of the extra strain(?)

Agree with above; seems to be the consensus. Built for heavy duty use due to being under continuous load/strain.

----I have bought several 67 351 low horse marine motors out of cabin cruisers that were parted out around here. They were all 4-bolt main blocks. Can't remember weather they had oil cooler holes or not.....Bill S

Hi Guys, trying to educate myself here. May I ask what the reliefs cut out at the top of the cylinders Is/are? Thanks Rob

They are valve reliefs.

See the relieved area on the forward side of each cylinder on the deck surface?


Jason