1970-81 Chevy Camaro LS1 1970-81 Headers with 1-7/8″, Made from 304 stainless steel, for maximum corrosion resistance. All tubes are CNC mandrel bent for optimal flow. Also 3/8″ CNC Laser cut flanges, 3″ OD slip fit collectors with O2 bungs. Includes 1″ set-back steel motor-mount adapter plates for small block motor-mounts. Also, includes bolt kit and High Temp RTV. All TIG welded for strength and durability. These kits come with a lifetime warranty and proudly made in the USA.