That's your engine block casting code. 3837004 decodes as a 1955-57 235 used in both trucks and passenger cars. Still need the block casting date codes and the stamped engine serial number to further ID your engine.
Below is a sample pic marked to show where all 3 codes can be found.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "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)
