BILLET 4340 oil pump gears for the Nissan SR20 (S13) engine. These gears are direct replacements for the OEM Oil Pump and measure approximately Ø81mm OD and 9.5mm thick (outer gear).

There are many variants for the SR20 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.