Chevy Chevelle 5.0L / 5.7L / 6.6L / 7.4L Automatic Transmission 1971-1973, Steel Long Tube 4-1 Exhaust Headers with Adapters by Doug Thorley Headers®. Collector Outlet Diameter: 3". Header Style: Long Tube. Backed by over 50 years of knowledge and experience, Doug's headers are designed to outflow your stock exhaust manifolds by leaps and bounds. These headers will give your engine more horsepower and torque across the entire RPM range, no doubt about it! To make these headers last, Doug's made them out of industry leading 14-gauge mild steel tubing with 3/8" thick flanges. Topping all of that off, all of Doug's headers come beautifully ceramic coated to greatly reduce under-hood temperatures and protect the headers from the environment. All of this 100% American made, and backed by Doug's lifetime warranty of course! Unless otherwise noted, these headers are designed to fit the vehicle as it came from the manufacturer. This includes components like cylinder heads, chassis, steering, motor mounts, body mounts and bushings, etc. If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installer's responsibility to verify fitment.
|Header Material: Steel|
|Header Style: Long Tube|
|Collector Diameter: 3"|
|Header Style: 4:1 Long-Tube Header|
|Finish: Silver Ceramic Coated|
|Primary Tube Gauge: 14 Gauge|
|Flange Thickness: 3/8"|
|Bolts and/or Studs Included: Yes|
|Gaskets Included: Yes|
|Reducers/Adapters Included: Yes|
|Y-Pipe (Crossover) Included: No|
|Quantity: Sold as a Pair|
|Warranty: Limited Lifetime to original purchaser|
For over 50 years, Doug Thorley Headers has been an innovator in the automotive aftermarket. Driven by a passion for performance and superior quality, they are committed to developing 100% American-made products that will reliably deliver maximum horsepower and torque. Doug Thorley Headers® has been pushing the limits of automotive technology since they first invented the Tri-Y header in 1958, and they do it all on American soil.