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Old 12-25-2013, 08:54 PM   #9
Carl Spangler
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Join Date: Oct 2013
Location: Central Coast Ca.
Posts: 417
Re: Chevy Six Cylinder Casting Numbers

Greetings

My 1971 C10 (SPID indicates a base engine 250 ci) block has a date code of A 71 (perhaps Jan 7, 1971). The block # is 3994257 which doesn't show up on any of the listed resources. Any idea how I can authenticate this motor #? Oh, it's a Fremont build.

thanks
JohnG
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