I knew about the numbers on the "pad," but I thought the engines could be identified by the casting numbers on the block? I've known from in the past, that the numbers on the pad are not always legible, or milled off, as it was in my 225.
Norm
225 blocks, and 198 blocks are identical, and have the same casting numbers. The only difference between the 198 and 225 engines are:
1) crank (stroke)
2) rods (length)
Maybe cam specs, but I don't know about that.