Doug Thorley Headers® - Steel Long Tube 4-1 Exhaust Headers with Adapters

00 reviews|Item # 372848691
$621.00 - $706.00
In Stock -
1970 Chevy Chevelle
Fits Following Model(s):
  • 5.0L / 5.7L / 6.5L / 6.6L / 7.4L Automatic Transmission
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    Product Details

    Doug Thorley Headers

    Chevy Chevelle 5.0L / 5.7L / 6.5L / 6.6L / 7.4L Automatic Transmission 1970, 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.

    Doug Thorley Headers


    Header Material: Steel
    Header Style: Long Tube
    Collector Diameter: 3"
    Header Style: 4:1 Long-Tube Header
    Material: Steel
    Finish: Silver Ceramic Coated
    Primary Tube Gauge: 14 Gauge
    Tuned: No
    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


    • Street legal in all 50 states (most applications)
    • Super tough 3/8" flanges and 14 gauge tubing
    • Compliant to the toughest emission standards
    • Maximum torque and horsepower boost
    • A Doug Thorley Headers original design
    • 100% Made in America
    • Durable ceramic coating
    • Driven by a passion for performance and superior quality
    • Designed to maximize horsepower and torque of your vehicle
    • Made with meticulous attention to detail and unmatched craftsmanship

    Doug's Long Tube Headers replace restrictive stock exhaust manifolds with long primary tubes designed to dramatically increase the flow of exhaust gasses, and reduce power robbing back pressure within the exhaust system. Allowing the engine to breathe more freely improves power and efficiency, making Doug's Long Tube Headers one of the most cost-effective modifications you can make to your vehicle.

    The Long Tube Header is perfect for any high performance street or strip application. Each header is constructed from thick wall steel, and all come finished with Doug's beautiful ceramic coating for long-lasting performance.

    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.

    Warranty Information

    Doug Thorley Headers

    Limited Lifetime Warranty

    Unless otherwise specified, Doug Thorley Headers (hereinafter DTH) header products are warranted against defective materials and workmanship for as long as you, the original consumer purchaser, owns said header product. DTH exhaust products, defined as any component “downstream” of a DTH header product or OE factory exhaust manifolds, are warranted against defective materials and workmanship for a period of 5 years from the original consumer purchase date. These limited warranties are offered solely to the original purchaser, are non-transferrable and proof of purchase is required for any warranty claims. These warranties shall be limited to the repair, adjustment, and/or replacement of defective parts at the discretion of DTH. Authorized product(s) returned will be repaired or replaced also at the discretion of DTH. All warranties become void if any product shows evidence of any modification done without the express consent of DTH, and includes mishandling, bending, welding, mutilation of parts, and insulating wrap products. Nor shall DTH be responsible for any damages, whether consequential, special, contingent or otherwise; or expenses or injury that may arise from the use of DTH products. The bluing and discoloration of chrome exhaust products is considered normal, as is the dulling of ceramic coated products, and as such, coatings are not covered under the terms of the warranty. Environmental exposure and rust apparent during the extended life of products is also considered normal and excluded from the warranty. Any DTH product that has been discontinued from new sales for a period of 5 years or longer will no longer be eligible for replacement under terms of the warranty, the repair of any defective parts will be the only option. This warranty policy supersedes any other warranties offered by DTH. DTH reserves the right to modify the warranty policy at any time, and a detailed copy of sale terms, condition and warranty information is available upon request.

    Magnuson-Moss Warranty Act:
    Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More
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