360 Already Bored .030

pishta said

supposedly, the early 360 blocks were cast with 340 cores that were made for 4.04 off the bat so a +.040 may be just starting life.

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I have heard that, but I haven't seen one in person. I believe the ones that were allegedly on 340 cores were cast in 1970 for the '71 model year though, anything much later than that would have been on a 360 casting. I don't think the OP's '72 cast engine would be like that.