Hedman HTC Hedders - 70-74 Challenger / 66-74 Charger / 68-74 Road Runner H760C49XXL Dual 3/4" NPT ports allow

Dual 3/4" NPT ports allow for coolant feed from either side of the engine

1970-1974 Buick Estate Wagon

excessive intake plenum volume

Ideal for both oval track and drag racing engines operating between 3500 and 7500 rpm

2001-2019 GMC Sierra 2500 HD

Hedman HTC Hedders - 70-74 Challenger / 66-74 Charger / 68-74 Road Runner H760C49XXL Dual 3/4" NPT ports allowHedman Hedders HTC Coated Headers; 1 3 4" Tube Diameter; 3" Collector; Full Length Design Hedman's Standard duty, Uncoated Hedders are manufactured using 18 gauge, mandrel bent primary tubes (some models built using thicker 16 or 14 gauge tubing), and 1 4 flanges (some models use 3 8" flanges). Hedman Hedders has been manufacturing quality headers in the USA since 1954, and classic musclecars is their specialty. Each set uses mild steel, smooth