Engine #'s

I was looking for engine numbers on the engine "pad" in front of the right head ,none there.

I went to the back of the block and found 3 engines with the same number.
3970010 302 1969
3970010 327 1969 trucks and industrial
3970010 350 1969-1980

Where do I look now?
Thanks

 

Those are just casting numbers. without stamped numbers on pad you will have to look inside.

 

SBC Casting numbers CLARIFICATION????? ...

 

Block was quite possibly "decked" at some point. DD

 

you have about a 99% chance it's a 350

 

........and that it's a 4" bore. DD

 

crank flange is the only way to be sure....

 

Shaggy, what am I looking for on the crank flange?

 

Nah - 99% chance it's a DZ302 - aren't they all....

 

302 is round with a knotch, 327 has it's own shape as does 350