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Im trying to figure out what engine I got in my car.
Block casting= GM 40 3970010
number in front of head (passenger side) was very hard to read but I think it was= ???213CHC and 15S22398?.
The engine is not the original and I dont know what car it came out of?
I would really like to know if this engine is worth building on or I should get a new crate engine?
The block casting number indicates a 350 cid engine. I believe that casting came as both 2 and 4 bolt mains. Hopefully someone else will have more. I think a more detailed answer is in the "CHC". Good luck, and...