Z-SERIES LARGE JOURNAL
Medium Eccentricity The Clevite Z-Series is constructed of tri-metal cast copper-lead using a thin lead-indium overlay which will be skin bored after plating to provide the best possible surface finish and appearance combined with an extremely tight wall thickness tolerance for consistent fit and clearance control. Rod bearings are shortened slightly on one side to provide additional crankshaft fillet clearance without the addition of a large ID edge chamfer. Other features such as hardened steel back, high crush and the availability of extra clearance, .001 undersize and a dowel hole will be consistent with the current H-Series parts. Main bearings incorporate partial grooves at each parting line in the lower half to extend total grooving to approximately 220 degrees. This is intended to carry pressurised oil closer to the actual load area in the lower mains as well as increasing oil supply to the connecting rods. Main bearings will be shortened slightly on both sides to provide additional fillet clearance without the need for oversize ID chamfers. The Z-Series bearings are produced with a medium level of eccentricity and are intended for racing engines except blown fuel.
Description	Part Number	Type
CHEV 302-400	CLCB663Z	STD
CHEV 302-400	CLCB663Z	001
CHEV 302-400 +.001	CLCB663ZX	STD