BILLET 4340 Spline Drive oil pump gears for the Nissan RB25 and RB26  engine. These gears are direct replacements for the N1 Oil Pump and measure approximately Ø77mm OD and 11mm thick (outer gear).

These gears must be used with spline drive collar.

There are many variants for the RB25 and RB26 engine so please check the sizing before you purchase.

This set replaces the standard gears which are prone to failure even on light modification. The factory gears are sintered (powdered metal, compressed under extreme pressure and heat) and were never designed for high horsepower or high RPM applications.

Precision machined from 4340 billet steel, featuring an N1 spec ‘wave’ profile for higher flow, HSE gears have been repeatedly proven under extremely harsh conditions. All HSE oil pump gears now go through isotropic polishing for stress-free, smooth running.