the bearings should say on the back. I think most 455 cranks are the nodular. if the block isn't cracked you got a decent deal. why chance a used unknown oil pump. they are only a few bucks for some piece of mind. but it's also not hard to check the clearances either. you know the drill, search www.realoldspower.com. on the crank. edit, oh and the spring dealio is the bypass. R.B.