Sometimes this website can be helpful for decoding chevy engine numbers: http://www.nastyz28.com/chevy-engine-code-stampings.php
What Chevy engine has the casting number 3970011?
The Chevy engine with that casting number was made in 1993.
What Chevy engine block has the castin I mean casting number 397004
The Chevy engine with that casting number was made in 1993.
350
1969
You have a 1973 nova 350
1987
1969
That # was used from 70-76.
I have a 1996 305, Vortec with that number on it.
1996