engine bearings posted by wh0sjeff on January 25, 2014 at 03:45 PM
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Because 'Race' bearings (Assuming youre talking ACL bearings here) are for engines that will have the mains line honed and crank polished to proper tolerance (Usually larger than OEM tolerances).
Or *gasp* shim'd as necessary to achieve the desired tolerance.
------------------------------------------------------------------ 1992 300ZX NA 5 Sp (Dead) 1990 300ZX NA Auto 2+2 (Dead) 1990 300ZX TT 5 Sp (Building) 2004 G35 Sport 6MT (DD)