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Old 04-30-2017, 11:45 PM   #3
Coley
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Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
Re: 71chevy 350 engine

As Tim said...the 397 is simply the casting number and was used for a variety of applications including, trucks, cars, vans, etc.
You have to take a long look at the revealed casting area on the front, passenger side of the engine block...just ahead of the head.
There will be a surface there around 3"-4" long and it will have some alpha numerics stamped into it.
This is the information that will determine what your engine came in.

Welcome to the forum!!

Coley
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1966 Chevy 1/2 ton (Florida- Red/white)
1972 Chevy 1/2 ton (California- Blue/white)
2005 Chevy Silverado HD2500/Duramax
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