It probably means that the engine was bored .060 over when it was rebuilt. Thats the max you can bore the engine. If you ever get head gaskets, make sure they are for .060 overbored pistons.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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