Overview:Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16" flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat and corrosion resistant metallic ceramic thermal coating that increases exhaust velocity and reduces underhood temps for increased performance.Features: Fuel Economy From The Engine Leak Test For Max Performance Ceramic Headers Rust And Corrosion Resistance Mandrel-Formed Power Plenum Leakproof O-Ringed Port Seals Include All Mounting Hardware Application: 1973-1986 Chevrolet C20 Suburban 1975-1986 Chevrolet C30 1975-1986 Chevrolet C20 1973-1980 Chevrolet C10 Suburban 1979-1986 GMC C2500 1979-1986 GMC C2500 Suburban 1979-1986 GMC C3500 1968-1974 GMC C15/C1500 Pickup 1968-1974 GMC C25/C2500 Pickup 1968-1974 GMC C35/C3500 Pickup 1968-1974 GMC K25/K2500 Pickup 1968-1974 GMC K35/K3500 Pickup 1968-1974 Chevrolet C10 Pickup 1968-1974 Chevrolet C20 Pickup 1968-1974 Chevrolet C30 Pickup 1968-1974 Chevrolet K10 Pickup 1968-1974 Chevrolet K20 Pickup 1968-1974 Chevrolet K30 Pickup 1975-1980 Chevrolet C10 1987-1991 GMC R2500 Suburban 1976-1980 Chevrolet K10 1977-1981 Chevrolet K30 1973-1976 GMC Jimmy 1975-1978 GMC C25 Suburban 1975-1978 GMC C35 1975-1978 GMC C15 1975-1978 GMC C15 Suburban 1975-1978 GMC C25 1976-1978 Chevrolet K5 Blazer 1976-1978 GMC K25 1979-1981 GMC K3500 1976-1978 Chevrolet K20 1989-1991 Chevrolet R2500 Suburban 1973-1974 GMC C15/C1500 Suburban 1968-1969 GMC K15/K1500 Pickup 1976-1977 GMC K25 Suburban 1987-1988 Chevrolet R20 Suburban 1979-1980 GMC C1500 1979-1980 GMC C1500 Suburban 1974 GMC C25/C2500 Suburban 1974 GMC K15/K1500 Suburban 1974 GMC K25/K2500 Suburban 1976 GMC K15 1980 GMC K1500 1987 GMC R2500 1987 GMC R3500 1973 Chevrolet Blazer 1987 Chevrolet R20 1987 Chevrolet R30 1973 Chevrolet K20 Suburban Specs: Brand Flowtech Collector Diameter 3.00 inch Emission Code 4 Engine Big Block Chevy Header Finish Silver Ceramic Header Style Long Tube Primary Tube Dia. 1-3/4 inch Product Type Headers Tube Material Mild Steel Warning California Proposition 65