Clevite Race H Main Bearings

In the context of the R35 GT-R, 'Grade Zero' refers to the standard bearing thickness. While Nissan uses multiple specific grades (0, 1, 2) for factory matching, this Clevite set is manufactured to the standard 'Grade 0' specification, serving as the baseline for most aftermarket engine builds.

Clevite H-Series bearings are race-specific. They feature a tri-metal construction with a hardened steel backing and increased 'crush' for better retention at high RPMs. Unlike OEM bearings, they lack flash plating to ensure better seating and heat transfer.

You should choose this H-Series (Standard) set if your crankshaft journals and block align with factory standard oil clearance specs. The HX-Series is designed with slightly more clearance (.001” extra) for engines requiring looser tolerances or specific oiling setups.

Yes. Clevite H-Series bearings are engineered with enlarged chamfers on the edges. This design specifically clears the larger fillet radii found on high-performance aftermarket crankshafts (like stroker cranks) to prevent edge loading.

Generally, no, if your block and crankshaft are within standard factory specifications. However, precise measurement of oil clearances is mandatory during assembly. If clearances are too tight, you may need to mix with HX shells or polish the crank.