Nate, the hash marks are at the rear of the block, above the starter motor and on the other side of the block in the same place. Every 261 I have seen has them, but some people claim early PG 235 engines were marked the same.I have never seen a 235 with hash marks. The casting # is a better way to check it out.
Inverse, your casting # show a 60-62 261
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[This message has been edited by Tony (edited 04-19-2001).]
