Melling high performance CNC machined and hard coat anodized oil pump wet sump, internal, standard volume, high pressure, 7/8″ inlet. Fits GM LS Chevy 4.8 5.3 6.0 6.2L 99-15 Gen 3 and some Gen 4 engines. Factory installed 70 psi by pass spring and a lower 60 psi blue spring included. Screw in relief valve plug. Note oil pump pressure can vary due to engine clearances and modifications. Actual product may differ from image shown.