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For products engineered for a first place finish, choose King Bearings. King HP Series Main Bearings are great for high-load, short duration racing and medium-load, long duration racing. This includes drag racing, tractor pulls, and circle track racing. These main bearings are bi-metal aluminum silicon alloy with a fine micro-bore finish that are 3/4 grooved for improved oiling to the rod journals. Get back to first place with King HP Series Main Bearings and Speedway Motors' same-day shipping!