Block casting no

[John M.]

I have a 454 block with the casting number 14015445 and the date code is 304. Does this block use a 1 piece rear main seal? Thanks for your help.

[Joe L.]

Re: Block casting no

John-----

The GM casting #14015445 was produced for truck applications from 1975 through 1987. It is a 2-piece seal block.

[John H.]

Re: Block casting no

John -

That block was used in '75-'87 truck applications, and has a 2-piece rear seal; the one-piece rear seal didn't show up until the Gen V big-blocks.

[John M.]

Re: Block casting no

Thank you, Joe and John