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Doug's Headers D521-R

Uncoated/Raw Headers 1965-1968 Pontiac 326-455 1-3/4" Tube Diameter

Doug's Headers D521-R


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Doug's Headers D521-R Uncoated/Raw Headers 1965-1968 Pontiac 326-455 1-3/4" Tube Diameter $626.99
Uncoated/Raw Headers
  • 1965-6198 Pontiac 326-455
  • 1-3/4'' Tube Diameter
  • 3'' Collector
  • D-Port Port Shape

  • Doug's Headers D521-R Details

    Pontiac - 1-3/4'' Tube Diameter


    • 1965-1968 Bonneville, Catalina
    • 1965-1968 Grand Prix


    • Requires removal or modification of locking steering columns if equipped.
    • Some factory heads do not have end bolt holes and should be drilled and tapped to assure proper sealing.

    Emission Code:

    • The product accompanying this document is legal only for off-highway use (except in California or states that have adopted California emission standards), racing use or for use on pre-emission-controlled motor vehicles/motor vehicle engines (pre-1974 domestic vehicles certified to California standards, pre-1974 domestic vehicles certified to federal standards and all pre-1974 foreign vehicles), per the manufacturer's application guide.
    Y Y Y N Y N Y


    Steering System
    Brake System
    Manufacturer's Part Number:

    Every Doug's Header is Tuned with the Proper Tube Size & Length to Efficiently Remove Exhaust Gasses from Each Cylinder

    Headers feature 3/8'' flanges and 16-gauge tubing on passenger car applications. They include all necessary mounting hardware, collector reducers or connection pipes, premium gaskets and detailed instructions. Headers are available in either a Metallic Ceramic Thermal Barrier Coating or a uncoated raw finish. The Metallic Ceramic Thermal Barrier Coating will withstand up to 1400 degree temperatures! This coating is polished which increases corrosion resistance over 60%!

  • Thick Flanges Prevent Warping
  • Stitch Welded Ports for Added Strength
  • Machined Sealing Bead Eliminates Leaks
  • Heavy Gauge Tubing for Longer Life
  • Precision-Formed Collectors Reduce Back Pressure
  • CNC Mandrel-Bent Tubing Provides Accurate Fit & Better Flow

    See More Info for Applications Listing

  • Does Doug's Headers D521-R fit your vehicle?

    Narrow Results

    1965-1968 PONTIAC CATALINA

    • EngineType: ALL
    • SubModel: ALL

    1967-1968 PONTIAC GRAND PRIX

    • CC: 7014
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 428
    • EngineType: V8 ( 7.0 L / 428 )

    1967-1968 PONTIAC GRAND PRIX

    • CC: 6555
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1965-1966 PONTIAC GRAND PRIX

    • CC: 6900
    • Liter: 6.9
    • SubModel: BASE
    • CUI: 421
    • EngineType: V8 ( 6.9 L / 421 )


    • EngineType: ALL
    • SubModel: ALL

    1965-1966 PONTIAC GRAND PRIX

    • CC: 6376
    • Liter: 6.4
    • SubModel: BASE
    • CUI: 389
    • EngineType: V8 ( 6.4 L / 389 )
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations