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**COBALT** · 06-04-2002, 05:40 PM

Last night I made my third attempt at finding codes on my engine (350-not original).

I found the casting number on back part of the driver's side behind the head (3970010, or something like that), which tells me it's a 2 or 4 bolt main 350 between '69 and '80. Yippie. I already knew that.

...but I haven't been able to find much else, and climbing around on top of the motor is getting old quick. I checked all along the block where the heads attach to see if anything is stamped in the block, but there's nothing there. I also looked behind the passenger side head and found a couple of casting symbols (an "S" I think), plus what may be a three number code but that's about it.

My goal here is to find out WHERE this engine came from. The more I work on it the bigger the mystery. Can anyone clue me in as to where information would be to help me solve this puzzle?

06-04-2002, 05:40 PM	#1
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Engine decoding. What a pain... Last night I made my third attempt at finding codes on my engine (350-not original). I found the casting number on back part of the driver's side behind the head (3970010, or something like that), which tells me it's a 2 or 4 bolt main 350 between '69 and '80. Yippie. I already knew that. ...but I haven't been able to find much else, and climbing around on top of the motor is getting old quick. I checked all along the block where the heads attach to see if anything is stamped in the block, but there's nothing there. I also looked behind the passenger side head and found a couple of casting symbols (an "S" I think), plus what may be a three number code but that's about it. My goal here is to find out WHERE this engine came from. The more I work on it the bigger the mystery. Can anyone clue me in as to where information would be to help me solve this puzzle? __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.