67 big block

[Chris L.]

Is 3959512 correct block # for 67 427/400? Thanks in advance.

[Dick W.]

Re: 67 big block

Is 3959512 correct block # for 67 427/400? Thanks in advance.

Casting date should be mid to late '68, or later, as these blocks started appearing in early December of 1968. Not used in any '67

[Tim G.]

Re: 67 big block

3904351 is the correct casting number for a 1967 427/400 horse motor

[Cecil L.]

Re: 67 big block

3959512 is a service small block casting.

[Dick W.]

Re: 67 big block

3959512 is a service small block casting.

Oops! When I see 512 in the number I am thinking of the 3963512 which is the 427 block

[Joe L.]

Re: 67 big block

3959512 is a service small block casting.

Cecil------


I figure he must mean a 3963512. If so, that block was never originally used on a 1967. It first appeared in late 1969 and was used through 1971. Although it was used in late 1969 for 427 cid engines, it was primarily a 454 block.

[Jaime G.]

Re: 67 big block

So what is the correct answer?

[John C.]

Re: 67 big block

Tim had it correct, 3904351 is the block used for a 1967 400 HP engine. This block was machined for both 2 and 4 bolt main cap applications. A 400 HP engine should use a 2 bolt main cap block.