Clevite MS2199H H Series Main Bearing Set for GM Chevrolet LS 4.8L 5.3L 5.7L 6.0L 6.2L LSClevite H Series main bearings were developed primarily for NASCAR racing, but are well suited to other types of competition engines as well. They're especially good for engines that run at medium to high revs. They have steel backings with carefully selected overlays and a high crush factor, plus a medium level of eccentricity. H Series bearings have enlarged chamfers at the sides for greater crank fillet clearance and are made without flash plating