What SBC do I have.

[Cdncarnut]

Originally Posted by Jeff Stout

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

The crankshaft is definitely 302.

The T on the engine stamping usually indicates a truck block.
TDX 1972 307 van & bus 135HP 2 BBL C-10 & 1500

The original Z28 302's were 327 blocks with 283 cranks.
3" Stroke, 2" Rod Journal and 2.3" Main Journal with a 5822 casting number
The 1178's had a 2.1" Rod Journal and a 2.45 Main Journal.

The 307 block had the a 3.875" bore, while the blocks used for the 327 and 350 302's had a 4" bore
Engine displacement would depend on the bore and I am not sure how much the '72 307 block bore could be enlarged. It would have to go 0.125 over to make a 302.

I cannot find a 4 bolt 307 block in my literature, but that does not mean that they did not exist, as I have come across some weird stuff...

Hope this helps.

Now back to getting my trailer ready for my first race of the season.