I pulled a small block from a 1971 Gmc a few years ago and I was wondering what the specs are. Here is the numcers I found on the motor.
38 GM
3970010
This may not be the original motor that came in the gmc. I plan on rebuilding this motor to put in my 1948 Chevy 3600 wrecker.
Thanks for any help

Now boltless but looking
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