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Flowtech Tri-Y Header

Tri-Y Header 1-1/2" 1965-70 Ford 260-289-302 V8, Polished Finish

PART# 12120FLT

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Flowtech Headers are the perfect combination of quality and value. These Tri-Y style headers fit the popular 65-70 Ford 260/289/302 V8 engines. These Tri-Y style headers were originally designed for 1965-1966 Shelby GT350 Mustangs with a 289HiPo V8, 4-speed manual transmission, and manual steering. Over the years, Ford enthusiasts have used these headers in dozens of other vehicles to get that classic Shelby sound and performance. See Installation Notes for additional information regarding fitment details regarding these headers.


  • Mandrel-bent tubes provide consistent tubing diameters for smooth flow and increases the cylinder scavenging effect and improves engine breathing
  • Heavy duty 16-gauge tubing for increased strength and durability
  • 1-1/2” diameter primary tubes, 1-3/4” diameter secondary tubes for increased exhaust flow increasing performance and improving throttle response
  • 2-1/2” collector for maximum strength and exhaust flow
  • 3/8” thick header flange for a leak-free seal and maximum strength
  • Premium aluminum header gaskets included
  • Available in a high heat resistant black paint or polished finish


Collector Diameter2.50 inch
Emission Code4
Header FinishPolished
Header StyleTri-Y
MaterialMild Steel
Primary Tube Dia.1-1/2 inch
Product TypeHeaders
Part Number12120FLT



This part is legal for sale or use on Racing Use Only Vehicles

The following vehicles are considered Racing Use Only Vehicles:

  • Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street

WARNING: It is against the law to install this part on an Emissions Controlled Vehicle

Tech Resources

Please read the following information regarding fitment of these headers: - Attempt to install in any other application WILL require some modification - These headers will not fit vehicles utilizing an FMX, C-6, or AOD automatic transmission - May not fit some vehicles utilizing a C-4 transmission with 164-tooth bellhousing. Those using a 157-tooth bellhousing with require some clearancing on RH side of bell - Will NOT work on 351W motors. (Due to taller and wider engine dimensions) - Will not work with GT40-P cylinder heads - Headers will work with 10" or 10.5" clutch, use of a 1968-newer bellhousing will require clearance on LH side of bellhousing - 1969-1970 model vehicles may require additional clearance for steering box - Use of these headers on a non-HiPo model will require extra clearance for clutch linkage


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