Charles Andrews mention of the mid-70s Olmo Sutter brings to mind that the mid-to-late 70s was really that period when everyone seemed to be drilling, reprofiling, grooving, and otherwise, trying to shave a gram here and there. Actually, I was probably grooving in the late 60s as that was what we did then!! Was all of that started by the "Mexico" hour record or was it just a sign of the competitive times. I suspect that lighter alloys and steels and reliability concerns must have been the death knell to that sort of after-market lightening treatment. Anybody know? Lou Deeter, Orlando FL