It doesn't say gmc on the cover or anything for that matter the tin on the side goes around the spark plugs and i know it is a replacement engine and the numbers were not stamped into it ( in a earlier post ) i have checked the afore mentioned sites but as I am young and dumb where it concerns automotive older then the 60's I really don't understand how to read it also I am puzzled by the T prefix on the serial tag that gives a number but when i try to look it up it may appear to be a overstock 41 put into the truck? I will try to get the casting numbers and post them and maybe someone will be nice enough to help.
