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Doug's Headers 1967-71 Ford Mustang/Fairlane/Torino/Cougar 351C 4 Barrel Heads Manual Transmission 1 3/4" Long Tube Header D670S4

Doug's Headers 1967-71 Ford Mustang/Fairlane/Torino/Cougar 351C 4 Barrel Heads Manual Transmission 1 3/4" Long Tube Header D670S4
Doug's Headers 1967-71 Ford Mustang/Fairlane/Torino/Cougar 351C 4 Barrel Heads Manual Transmission 1 3/4" Long Tube Header D670S4
from $1,651.08 st

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Model: 5124771
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
D670S4.pdf312.46KB
D670S4-B.pdf312.46KB

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
Ford Fairlane 1970 5.8L / 351 / V8 Manual Transmission.
Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Ford Mustang 1967 4.7L / 289 / V8
6.4L / 390 / V8		 For use with 351 4V Engine Swap.
Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Ford Mustang 1968 7.0L / 428 / V8
7.0L / 427 / V8
5.0L / 302 / V8
4.7L / 289 / V8
6.4L / 390 / V8		 For use with 351 4V Engine Swap.
Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Ford Mustang 1969 5.0L / 302 / V8
7.0L / 428 / V8
7.0L / 429 / V8
6.4L / 390 / V8
5.8L / 351 / V8		 For use with 351 4V Engine Swap.
Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Ford Mustang 1970 5.8L / 351 / V8
7.0L / 428 / V8
7.0L / 429 / V8
5.0L / 302 / V8		 Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
For use with 351 4V Engine Swap.
Ford Ranchero 1970 5.8L / 351 / V8 Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Ford Ranchero 1971 5.8L / 351 / V8 Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Ford Torino 1970 5.8L / 351 / V8 Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Ford Torino 1971 5.8L / 351 / V8 Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Mercury Cougar 1970 5.8L / 351 / V8 Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length
Mercury Cougar 1971 5.8L / 351 / V8 Fits four barrel heads, 351C 4V, Boss 351.
Power Steering Cars require power steering bracket PN H7609.
Full-length

Specifications:

Collector Attachment 3-Bolt Flange
Collector Diameter 2.5 IN
Collector Port Diameter 2.5 IN
Cylinder Head Port Shape SAP
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 SAP
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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