Doug's Headers 1 3/4" 4-Tube Full Length D-Port Headers Pontiac Catalina 326-455 65-68 Raw Steel DHE-D521R

3/8" Thick machined flanges...no warping CNC mandrel bent tubes... accurate fit & better flow Precision formed long transition collectors and long tube design... reduces backpressure and increases higher RPM horsepower Heavy 16 gauge tubing...longer life Tubes are pre-polished to remove scratches and the header is left unfinished (raw steel) for individual customizing

Doug's STANDARD(-R) Headers come to you with a RAW Finish (No Coating) ready for your paint or your heat barrier coating.