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The SRP Professional Series pistons come with Teflon-coated skirts to reduce friction and deburred valve reliefs to avoid detonation from hot spots. Normally they come with a standard tension oil ring, but to get the most power from the combination, they swapped to an ultralow tension oil ring. They feared there might be some oil pumped up into the chamber since they didn’t have a vacuum pump. Nevertheless, with the perfect hone job on the block, there were no issues.