[Woodz428]

Because,as illustrated above, the casting #'s are used on a variety of engines, the crank # is pretty important for identity. Bore would narrow it down, but again, bores were used among various FE engines. The casting number should be on the #7 counterweight, although some had a number also on the #1. That is the 3.98 stroke crank, but I think most the other cranks I have here ( 390 as well as a 360) have the numbers located in the same area. Here are some of the crank #'s C6ME, 1U,1UB,A,1UA, B. Any of those would indicate a factory 428 crank, a couple of the numbers are the same as the 410( 390 block,428 crank).