It's probably a 1972 350.
It is an excellent GM block.
350 and 327 [1966 - 1980]
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.
4bolt 350ci
It's a 4" bore block. Has been used for 302, 327, and 350 engines.
1970 Z28...Stacy
on the block
how can i find what kind of engine i have
Gm 3970010 the model?
The block and just about all parts have a "casting number" on them. Your block #3970010 was used by GM from 1969 through 1980 in anything from a 1/2 ton pickup, to the HOT Z-28's. It could be either a 2 bolt or a 4 bolt design. What that means is that the crankshaft is held in the engine block by main bearing caps that are designed with either 2 bolts or 4 bolts. The 2 bolt is good for non-high performance, less than 6,000 RPM's. The 4 bolt design, spreads the rotational stess over a much wider area within the block is used for over 6,000 RPM's. Hope this helps.
350 cu/in block used in GM Goodwrench Crate Motor. Made in Mexico.
LSX is the largest small block its a 482 ci its made by GM