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That's being super safe which isn't a bad thing.....but, I'll go with .030 with steel rods any day of the week and have done one that was even closer. The dirt track guys will do that too but only with a short stroke and steel rods.Regardless of what you do, a good rule of thumb is to have .040" clearance between the piston and anything it might hit. So if the piston is .010" out of the hole, the OP should use .050" head gaskets.