Chevrolet Performance Gen 4 LS High Volume Oil Pump (For AFM/DOD Engines)
This genuine GM oil pump is known as a "high volume" design used on the 2007 and later LS4 5.3L W-Body applications, the LH6, LC9 5.3L Trailblazer, SSR, Truck & SUV 6.0L and 6.2L engines with Active Fuel Management (AFM). GM engineering determined that the increased oil volume was required to meet the demands of the AFM system. This pump uses a thicker gerotor with a slightly larger OD than the 12586665 standard volume pump. Dimensional this pump is identical to the 12571885 high volume oil pump but is uses a different by-pass spring! High Volume LS Oil Pump.
By-pass Spring Opens at 42-psi. Original Equipment on Most 2007 and newer V8 LS Engines with AFM.