Back in the late 60's through the mid 70's, the Can Am (Canadian American) series became what some believe was the pinnacle of American motorsports. The series had some of the wildest and fastest cars ever assembled by mankind.
I'm searching for information regarding the casting numbers of GM's aluminum big block engines that were created specifically for the Can Am series, and were the predecessor for the ZL-1 engines. I have a couple of these blocks and the casting numbers are 0-321270 (a Reynolds prototype block cast in 1968) and 3992040, a Winters foundry block cast in 1971 and taken from a Mclaren race car.
Now I'm faced with an opportunity to purchase an NOS Reynolds aluminum big block, casting #627273...................which I've never seen or even heard of. I know there are about 4 or maybe 5 variations of the Reynolds and GM aluminum big blocks, but this number (627273) is totally new for me. Has anyone heard of this number block, and if so, what are the details of it?