Performance Race HP Series Rod and XP Series Main Bearings Sets Compatible with 4.8L, 5.3L,5.7L and 6.0L Chevy LS Vortec's.

Standard size HP series Rod and XP series Main Bearings sets compatible with Chevy LS 4.8L, 5.3L, 5.7L, 6.0L Vortec's. MB5013XP + CR807HPN These HP-Series rod bearings were developed mainly for drag race applications needing a material harder than the Babbitt top layer. These applications demanded a structure that could withstand high loads for short durations and still offer higher embeddability and compatibility. In response, King developed the HP-Series, featuring the Alecular metal structure. These innovative, race-only Xtreme Performance tri-lecular bearings are proven track-tough to handle the ground-shaking power of your race engine. Built with enhanced tri-metal, these XP-Series main bearings layer copper lead construction with a nickel plate barrier and a lead/tin/copper babbit overlay over a steel backing in an adhesion process that provides superior stability and durability. Advanced control measures hit a bull's-eye, maintaining wall thickness tolerances far tighter than their competitors—an amazing +/- .0001 in.! These XP-Series bearings are narrowed for large radii crankshafts and feature enlarged, chamfered oil holes with full, 3/4, or 1/2 grooving for improved oiling. How many reasons do you need to use a specialist? XP-Series bearings deliver consistent and reliable performance with a high-load capacity, and the prognosis from the specialists is a long and happy life for your engine.