King HP Series Main Bearing Set, STD With .001" Extra Clearance - KBMB557HPSTDXMAIN BEARINGS, SBC L J Suit SB Chev L J 262 350 Part Number: KBMB557HPSTDX The HP Series featuring the Alecular metal structure used for high loads for short durations. Suitable for race applications such as drag racing which can benefit from a harder than Babbitt top layer material. Alecular also serves other performance applications that use nodular cast iron crankshafts, such as street strip and some levels of circle track racing.