I bought this pump for $303 at Piston Ring in Winnipeg and never used it. Fits Gen 3 and 4 LS engines (4.8, 5.3, 6.0 and 6.2). Melling high-volume oil pumps give you an additional 20 to 25 percent of much-needed oil volume for your performance application. Call or text Wayne @ 431-774-6320