| Clevite H-Series main bearings were developed primarily for NASCAR racing, but are well suited to other types of competition engines including the LSX Engines Gen III/IV. 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 for better seating. They're also available with either 180-degree or 360-degree oil grooves, as well as an extra 0.001 in. of clearance.
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