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5/2/07 1989 300zx FSM now Available. See Reference Section

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W-series Connecting Rod Differences

Connecting Rod:

The modified connecting rod has been increased in weight, along with an increase in small end internal bore. It can be identified by a "W" stamped in the side of the rod shaft as shown in illustration. NOTE: A "W" connecting rod requires a "W" piston, new style wrist pin, and modified crankshaft.

Sources Used on This Page: 1988 Nissan 300ZX Factory Service Manual, Nissan Technical Service Bulletin Number TS87-191 Date: December 28, 1987