The casting number says it is an early 1971 455 HO block as the seller claims. The YC code makes one suspect it is a dealer stamped service replacement block even though we cant see the sr on the EUN number. Or somehow the factory ran out of 2 bolt main 455 blocks on that day. Rocky Rotella is probably the best expert on early 455 blocks..
Last edited by tanksteve; 12-24-2021 at 08:09 PM.
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