What SBC do I have.

[Alan Roehrich]

Originally Posted by Jeff Stout

It shows 1178 is a 302. Checking stroke shows 3 inch. The stamping of TDX shows 1972 307. I will get to shop and check date and complete casting number.

The stampings mean different things depending upon the year of the block and production. If the block is not a 1972 production block, TDX does not denote a 307, and being on a 4 bolt main 010 block, it's obviously not a 307 two bolt main.



I do not recall a 307 built on a 350 (010) block. Most 307 blocks would not do well at 4.00" bore. If you have a 302 crank in a 307 block, you'd have a large journal 283.


It could possibly be a service replacement short block. Or, most likely, someone wanted a 302 and didn't have the original block, so they put a 302 crank in a 350 block.