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Doug's Headers 1968-72 Pontiac GTO/LeMans/Tempest D-Port Heads 1 3/4" Long Tube Header D590

Doug's Headers 1968-72 Pontiac GTO/LeMans/Tempest D-Port Heads 1 3/4" Long Tube Header D590
Doug's Headers 1968-72 Pontiac GTO/LeMans/Tempest D-Port Heads 1 3/4" Long Tube Header D590Doug's Headers 1968-72 Pontiac GTO/LeMans/Tempest D-Port Heads 1 3/4" Long Tube Header D590
from $1,779.89 st

Available Options

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Model: 5124759
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
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Long tube headers provide the greatest increases in horsepower and torque across the entire RPM spectrum. The choice of racers worldwide, Doug's long tube headers are designed for the car owner who wants maximum power and the highest quality header on the market.
Features:
  • 3/8" Thick machined flanges to prevent warping
  • Precision formed long transition collectors and long tube design reduces backpressure and increases higher RPM horsepower
  • Heavy duty 16-gauge tubing for long life
  • Tubes are pre-polished to removed scratches before applying metallic ceramic or hi-temp black coating
About Doug's Headers

Doug's Headers are a fixture in the motorsports aftermarket, pioneering quality muscle car performance headers for decades. Unlike the competition, Doug's Headers prides ourselves on superior design detail resulting in a hassle-free installation for any application.

Downloads:

Download Name File Size
D590.pdf220.14KB
D590-B.pdf465.35KB

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Years Engine Fitment Notes
Pontiac GTO 1968 6.6L / 400 / V8 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac GTO 1969 6.6L / 400 / V8 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac GTO 1970 7.5L / 455 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac GTO 1971 7.5L / 455 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac GTO 1972 7.5L / 455 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac LeMans 1968 5.7L / 350 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac LeMans 1969 5.7L / 350 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac LeMans 1970 5.7L / 350 / V8
7.5L / 455 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac LeMans 1971 5.7L / 350 / V8
7.5L / 455 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac LeMans 1972 5.7L / 350 / V8
7.5L / 455 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac Tempest 1968 5.7L / 350 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac Tempest 1969 5.7L / 350 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter
Pontiac Tempest 1970 5.7L / 350 / V8
6.6L / 400 / V8		 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.
Fits D-Port heads Only.
Full-length
with Floor Shifter

Specifications:

Collector Attachment 3-Bolt Flange
Collector Diameter 3.0 IN
Collector Port Diameter 3.0 IN
Cylinder Head Port Shape D-PORT
Design Full-length
Flange Thickness 0.375 IN
Gasket Or Seal Included Yes
Gaskets Included Yes
Grade Type Performance
Header Style Full-length
Mounting Hardware Included Yes
Oxygen Sensor Port No
Part Type Exhaust Header
Port Shape D-Port
Primary Tube Outside Diameter 1.75 IN
Proposition 65 www.P65Warnings.ca.gov
Tube Wall Thickness 16 GU
Warranty Time 24 Months

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