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We recommend these main bearings for all LS-Series Engine Builds. This particular set of main bearings are .001" Oversize for crankshafts that need a tighter bearing tolerance due to polishing. Drag Race Engine Builders prefer the H-Series Bearings for their lack of flash plating, medium levels of eccentricity, enlarged chamfers for additional crankshaft fillet clearance and high crush. We recommend these main bearings for all LS-Series Engine Builds.