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I have a 76 that some one else put a big block 454 in not sure where the engine came from i got the casting numbers of the back of the block can someone tell from these numbers 3999289 sideways P GM T14 F2873 would like to know where this big block came from
If it's there; you'd get more specific feedback if you'd post the information stamped into the pad at the front of the block where the passenger side head meets the block.
casting on a big block
