Bill, I have a 1939, 40 & 41 GMC Book of Parts, but it doesn't list a part number for the ID plate or whatever attaches it to the block. That book and the 1940 GMC Trucks Maintenance Manual X-4044 only shows what the plate looks like and where it's located on the engine. It doesn't describe how it's attached. Below is a screen grab from a 228 picture I found on line that looks to show the plate held to the block by driven round headed rivets. Someone with more info on these engine plates may be of more help in ID'ing what rivets might be used to reattach it to the block.
~ 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)
