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**mattfranklin** · 05-10-2021, 06:53 PM

It's got a good casting number (3970010). Same as the LT-1 in the Z-28 and high-perf Corvette, as well as trucks. Some came with 4-bolt mains, some came with 2-bolt mains.

05-10-2021, 06:53 PM	#4
mattfranklin Senior Member Join Date: Dec 2011 Location: Moraga, CA Posts: 809	Re: 350 identification help It's got a good casting number (3970010). Same as the LT-1 in the Z-28 and high-perf Corvette, as well as trucks. Some came with 4-bolt mains, some came with 2-bolt mains. __________________ (Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340