1968-1972 GM A-Body LS Swap, 1-3/4 X 3" Long Tube Headers, Silver Ceramic Coating;1-3/4” primary tubes and long transition 3” collectors with merge spears for maximum flow and increased exhaust velocity; Tight-tucked design provides maximum ground clearance; O2 bung locations optimized for wide-band O2 sensor operation/reliability; Optimized tube bend geometry clears all factory stock vehicle components (including the A/C evaporator case), allows for easy starter motor/spark plug serviceability; Compatible with all GM automatic and Tremec T56/T56 Magnum transmissions; Designed to work specifically with our Hooker Transmission Crossmembers (P/N 71222007HKR or 71222021HKR) and Engine Mounts (P/N 71221006HKR or 71221007HKR) for a trouble free install; Mild steel headers offered in Painted, Silver Ceramic Coated, and Darkside Black Ceramic Coated finishes; Manufacturer's Limited Lifetime Warranty; All hardware included;