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Old 03-07-2010, 03:34 AM   #22
FLEET72
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Join Date: Jan 2007
Location: Sonoma, CA
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Re: Request help for a GMC jimmy restore project...

3850817 is the block casting number. It was used from 1962 through 1978. It came in 230 and 250 cubic inch versions. It has a 3.875" diameter bore.
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