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: Tuned-length primary tubes for street performance Mandrel-bent tubing for smooth exhaust flow Light weight & sturdy 16 gauge tubing Mandrel-formed Power Plenum collector for low back pressure Sturdy, leak-tested O-Ring port seals Engineered for a precision fit Designed for easy, trouble-free installation Includes all mounting hardware and premium gaskets Works with air conditioning, automatic and power steering Application: 1963-1970 Chevrolet Bel Air 1963-1970 Chevrolet Impala 1963-1969 Chevrolet Biscayne 1966-1970 Chevrolet Caprice 1967-1969 Chevrolet Camaro 1969-1970 Chevrolet Nova 1968 Chevrolet Chevy II 1970 Chevrolet Kingswood 1970 Chevrolet Townsman Specs: Brand Flowtech Collector Diameter 3.50 inch Emission Code 4 Engine Big Block Chevy Header Finish Silver Ceramic Header Style Long Tube Port Shape Round Primary Tube Dia. 1-7/8 inch Product Type Headers Tube Material Mild Steel Warning California Proposition 65