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The KB piston design positions the top rings closer to the combustion chambers. Thus they operate at a higher temperature and require increased endgap settings. While a typical cast or forged piston top-ring endgap might be 0.020, Emley set the Total Seal moly-filled top rings at 0.030 to allow for plenty of expansion. The second ring endgap is set at a more traditional 0.018 inch due to its greater distance from the combustion process and cooler operating temperature.