Going to .060" over is pushing things a little. I'd very much prefer .040 over if that's an option. Definitely consider sleeving #1 if it's got more taper wear than the other cylinders, even if you only go with the thinwall 3/32" sleeve. One sneaky trick is to use 307 V8 pistons- - - -they're flattops instead of the 1/4" dish top that the 250 piston has, and every other dimension is the same, bore size, compression height, wrist pin diameter and weight. I've also milled the head on a 250 engine .050" without having any piston/valve interference problems. With the flattop pistons and a milled head, the engine really comes alive.
Jerry

Last edited by Hotrod Lincoln; 02/06/2014 5:54 AM.
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