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Doug's Headers 1964-70 Ford Mustang/Mercury Cougar Small Block Auto Transmission 1 5/8" Long Tube Header D690YA

Doug's Headers 1964-70 Ford Mustang/Mercury Cougar Small Block Auto Transmission 1 5/8" Long Tube Header D690YA
Doug's Headers 1964-70 Ford Mustang/Mercury Cougar Small Block Auto Transmission 1 5/8" Long Tube Header D690YA
from $1,743.99 st

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Model: 5124772
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
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Doug's is the pioneering force behind the popular TRI-Y design for cars and trucks. The unique, shortend, paired primary tubes increase mid-range torque without sacrificing top end power. TRI-Y's are a great choice for daily drivers and heavy duty trucks looking to increase power from idle up to 4500 RPM while maintaining maximum fuel efficiency.
Features:
  • 3/8" thick machined flanges to prevent warping
  • CNC mandrel bent tubes ensure accurate fit and better flow
  • Heavy 16-guage tubing for longer 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
D690YA.pdf317.69KB

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 Mustang 1964 4.3L / 260 / V8
4.7L / 289 / V8		 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Ford Mustang 1965 4.3L / 260 / V8
4.7L / 289 / V8		 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Ford Mustang 1966 4.7L / 289 / V8 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Ford Mustang 1967 4.7L / 289 / V8 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Ford Mustang 1968 5.0L / 302 / V8
4.7L / 289 / V8		 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Ford Mustang 1969 5.0L / 302 / V8 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Ford Mustang 1970 5.0L / 302 / V8 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Mercury Cougar 1967 4.7L / 289 / V8 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Mercury Cougar 1968 5.0L / 302 / V8
4.7L / 289 / V8		 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
Full-length
Mercury Cougar 1969 5.0L / 302 / V8 Does not fit with C6 Transmission
On Power Steering Cars, Installation requires power steering bracket PN H7609.
Vehicles with Air Injection heads will require grinding of the header flange to fit.
Tri Y design.
Use recommended C5ZZ16A052E "export brace" if shock mount center to center dimension is less than 33 3/4"
Will not fit GT40 "P" heads.
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 1.625 IN
Proposition 65 www.P65Warnings.ca.gov
Tube Wall Thickness 16 GU
Warranty Time 24 Months

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