These Hooker BlackHeart LS swap headers fit 1975-1987 GM C-10/20 2WD Trucks, and 1975-1982 Blazer/Jimmy 2WD vehicles. The long-tube header design provides optimum engine performance with stainless steel construction for strength & corrosion resistance. These Headers are designed for use with BHS540 Premium engine mounting brackets (1975-1987 C10/C20 & 1975-1982 Blazer/Jimmy). Easy installation since these headers are part of the Hooker BlackHeart LS swap system (all parts engineered to work together as a system for simple bolt-in LS engine swap).