Engine Oil Pump Relief Valve Kit

Product information

1x Oil Pump Relief Valve Spring 1x Relief Valve 1x Oil Pump Bung 1x Oil Pump Bung Sealing Washer 3x Spring Shims Will Fit all 10, 11 & 12mm Subaru EJ Oil Pumps 10mm use 2 shims from the factory 11mm Uses 1 Shim from the factory 12mm uses 1 shim from the factory Adding 1 shim over the base oil pressure can see up to 4% increase in oil pressure throughout the full RPM range