Long-Tube Exhaust HeadersFord T-Bucket Street Rod w/Small Block Chevy 350 Engine1.625 in. Primary Tubes3/8 in. Flange ThicknessStainless Steel Increase your horsepower and torque for your ride--just bolt on these Procomp Electronics headers! These headers are designed with 3/8 in. thick laser-cut flanges and mandrel-bent primary tube. If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installers responsibility to verify fitment. Size Notes: Flange to Inside - 14 1/2" Flange to Outside - 20" Flange to End of Pipe - 38"