Oil pump fits: Gen III and Gen IV, 4.8L, 5.3L, 6.0L, 6.2L engines. Volume will increase by 18% over stock oil pumps, hard anodized coating for wear and performance and will fit with stock timing cover.
Oil pressure to be expected when red high pressure spring is installed will be in the range of 55-65 psi and with the lower pressure blue spring you can expect about 10 psi less. Final pressure will depend on weight of oil, bearing clearances and engine RPM.