Anybody have input on crate motors?

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Maybe GM have improved things since then but it is my understanding that the Goodwrench crate motors were the blocks and pieces that didnt mmet the exacting tolerances of factory installed engines ..... as a boring machine or mill gets used more and more its work gets sloppier and sloppier until the dies and cutters have to be retooled .... the GM engines are the final blocks and parts that were produced right before retooling.