Thread: GM Engine?

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I think that you probably have a 1969 to early 70’s 350. Look close at the casting number and it’s probably 3970010. That would match with the crank, i.e., 1182 is a forged crankshaft (3.480 stroke) for a 350 that uses a two piece rear seal.

Great motor to build. Have fun.

Regards,
Glenn

Well I see we're all on the same page, re; 350 - however, this is the same casting number used in the 370HP Corvette - that and the forged crank tells me it's not a "plain Jane", rather a good solid high performance base.

It is 3970010 def, so ur telling me I have a brand new 1969 corvette motor!?!? How F!?$ing lucky am I? Are we sure on this!? If that's true aren't these hard to come by, ESP all original brand new?

If I'm not mistaken, the LT1's came with a sheet metal windage tray. That would explain the longer cap bolts....
http://www.poltergeist.us/page/Elky/...pump_tray.html

The casting number was used on a lot of motors....including 2bbl trucks. Look on the pad that is just in front of the passenger cylinder head...look for a two letter code that is stamped, not cast.

The windage tray bolts are factory on some motors including a DZ motor out of a Z/28 and a 70 LT1. The pop up pistons are also a plus. However, these could have been added. In the early 70's, a new Z/28 partial engine assy was about $400 at the dealers. If you have a forged crank, the crank is worth more than that now.

Your motor could be either a 3" stroke or a 3.48" stroke motor....it is in such corroded shape that it probably will not turn over so you can measure the stroke.

Get the letter code....unfortunately, some replacement engines did not have a letter code stamped on the pad......