GM engine block # 3970010 was used as early as 1968 on some 327ci engines. From 1969-1979 it was a 350ci engine. It could be a 2 or 4 bolt block used in cars, trucks and even corvettes. You can also find these blocks with a "Mexico" stamp on them near the block ID. It has been said that these are high nickle content blocks and may be stronger than others.
350 and 327 [1966 - 1980]
Gm 3970010 the model?
its a 1967 engine most likely from a chevelle with 275 HP
it is a 1969-1979 motor it was used in cars, trucks, and vettes
A81 should be January 8, '71,'81,'91.
It's a 4" bore block. Has been used for 302, 327, and 350 engines.
It's probably a 1972 350.
4bolt 350ci
Not much info at mortec. It is a 350, made from 80-85. Can be either 2 or 4 bolt mains.
Check out this site. http://www.mortec.com/
1968------327 & 1969-79 ----350
What engine casting number is 14010207