Compatible with Chevy: Can fit for C10, C10 Suburban, C1500, C1500 Suburban, C20, C20 Suburban, C2500, C30, C3500,Caprice, Corvette,El Camino, G10, G20, G30, Impala, K10, K10 Suburban,K20, K30, K2500, K5 Blazer many models. Compatible with GMC: Can fit for C2500, C2500 Suburban, C35, C3500, Caballero,G1500,G2500,G3500, G35, Jimmy, K15, K15 Suburban, K1500, K25,K2500,K35,K3500, R3500 , Sprint, V1500,V2500,V3500, Yukon many models . compatible with Oldsmobile: Can fit for Cutlass Cruiser, Cutlass, Omega, Starfire many models Compatible with Pontiac: Can fit for Bonneville, Firebird, Grand Am, Grand LeMans, Grand Prix, LeMans many models. Fits for Engine: 681models fit for 7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated 318models fit for 6.6L 400Cu. In. V8 GAS OHV Naturally Aspirated 1242 models fit for 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated 16 models fit for 5.7L 350Cu. In. V8 DIESEL OHV Naturally Aspirated 30 models fit for 5.7L 350Cu. In. V8 CNG OHV Naturally Aspirated 633 models fit for 5.0L 305Cu. In. V8 GAS OHV Naturally Aspirated 20 models fit for 4.4L 267Cu. In. V8 GAS OHV Naturally Aspirated NOTE: To ensure accurate fitment, please confirm your vehicle information in the above compatibility section and the description before use to avoid errors.