Point is well taken, and I agree! It is like opening the hood of a Chev. car, see a V-8 but not know what flavor it is until you see the numbers and casting number. Sometimes you can tell by a few items, for instance an early big block has the nice shaped valve covers, but even then, it is hard to tell the difference between the 348 and the 409. We have a chance for snow today but I will try to get down with some tools, a good light and mirror and get some numbers to share here. Maybe this group can assist with the identification of the mystery Chevrolet engine that now sits in a GMC pick-up truck.
Al
Alan