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Also, the dish and intake valve relief in the piston dome were .300-inch deep, so the top ring groove needed to be at least .150-inch farther down. The quench areas of the piston dome were .600-inch thick and, after much internal debate and contemplation, I left them alone with no lightening. I felt the piston would take longer to heat up and forestall the detonation process; at least for a short while it would be a heat sink. I wasn't too worried about weight because the contest runs were made at 300 rpm per second acceleration rate. At 600 rpm per second, it would have been a big problem. I believe that the ring being farther down and away from the heat saved me at the Memphis test."