Wow!!! Original paper work from the dealer and still has it's original engine in the bay - gold mine city there sir! yahoo To back up Mike B's engine ID as a 235, see the snapshot below from the GM Heritage 1951 Chevrolet Truck data with the engine serial number decoding.

You might want to save the GM Heritage site link as it provides a huge amount of info on your truck. smile
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)