King SI Series Main Bearing Set, .020" Suit SB Ford 289-302 & 5.0L Windsor (KBMB529SI 020)

SI-Series Bearings

KING "SI" Bearings are made of an innovative bi-metal silicon/aluminum alloy, the newest generation of KING Alecular bearing technology. The silicon particles in the bearings help round off high spots on the crank surface during engine operation, which reduces friction and related wear. The SI bearings also help minimize debris embedment, since hard particle debris is instantly flushed through the bearing and filtered out of the engine rather than scoring the crankshaft and causing long term damage.