Dougs Headers Tri-Y Ceramic Coated Automatic Transmission 351W 1967-1970

Dougs Headers: D669Y
MSRP: $1,023.65
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Dougs Headers Tri-Y Ceramic Coated Automatic Transmission 351W 1967-1970
Dougs Headers

Product Description

Dougs Headers 1-3/4"-2" Stepped Design Ceramic Tri-Y Headers for all 1967, 1968, 1969 and 1970 Mustangs with a 351W Engine.

These will not work with the original style clutch linkage on a manual transmission, you must upgrade to a clutch cable conversion. Every header from Dougs Headers is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Dougs Headers are carefully developed for the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.

*Tri-Y headers yield maximum power from off idle to 4500 RPM, making them well suited for maximum mid-range torque.
*1965-1968 Mustangs equipped with power steering require a slave cylinder lowering bracket (SCB).

These Dougs Headers come with all the necessary mounting hardware, collector reducers, premium gaskets and detailed installation instruction sheets. The extra thick gaskets are rated up to 1100F, pressures to 3700 psig (255 bar) and are designed for an exact port match with all Dougs Headers.

*These headers have a 1-3/4" to 2" primaries that go into 3" collectors.

Metallic Ceramic Thermal Barrier Coating (MCTBC) is simply the best header finish on the market and comes standard on all Dougs Headers products. MCTBC protects and extends the life of headers by creating a thermal barrier that significantly lowers underhood temperatures and protects the substrate metal from thermal fatigue. After MCTBC is applied, it is polished with a vibratory finishing process that produces a high luster aluminum appearance. This coating is easy to maintain and will last for years under normal operating conditions. The polishing process compresses and activates the coating, which increases the surface hardness to produce a finish that is 60% more corrosion resistant than an unpolished surface.

Order these Dougs Headers 1-3/4"-2" Stepped Design Ceramic Tri-Y Headers for your 1967, 1968, 1969 or 1970 Mustang with a 351W Engine from CJ Pony Parts today!

Similar Mustang Parts

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Installation Instructions

Mustang Installation

Mustang Applications

This product will fit the following Mustang years:

Product Reviews

Write a review
Dougs Headers Tri-Y Ceramic Coated Automatic Transmission 351W 1967-1970 is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Perfect fit I bought these headers for my 1967 mustang with a 351w, I remember doing alot of searching and found that long tube headers in a 67 mustang with a 351w would hang way too low, and I didn't want shorty headers either, these were the only headers I could find that were at least 1 3/4 pipes (didn't want to go with skinny headers either) that seemed like they would fit for my application. I found these Tri-Y Mid Length headers (never heard of Mid length before these, but these were exactly what I needed.) It was tough to find any reviews on them also (which is why I'm leaving one, hopefully this helps out) I was a little afraid to buy these because of 0 reviews, and because of the price, anyway I ended up getting the $150 cheaper version, which are non ceramic coated, just the bare metal (if I could go back in time, I would spend the extra money and get the ceramic coated ones now because they look so much better, I wouldn't miss that $150 now) These headers fit right in without any bending, heating up and hammering, or anything like that, that being said, I do believe you need to have a cable clutch conversion if you have a manual transmission because of the clutch linkage being in the way (I have a tremec 5 speed with a cable clutch conversion and everything clears) I remember being a little worried about the headers clearing the steering box, but they just barely fit around it. As far as the bottom of the headers and clearance to the ground, the collectors are set at a great height where nothing is hanging too low, it's also not too high. They are at a great spot, and they are pointing downward, so your exhaust will go down about 2 inches, then turn to go straight back under the car. My car is pretty low at the moment, enough that i've scraped my 1 1/8 inch anti sway bar on the floor, and I still haven't had any issues with header clearance. I'm pretty sure if I had long tube headers, they would be scraping the floor all the time with my ride height. Yes I would buy these headers again, I am super happy with them, I think these are the best headers you can get for a 67 or 68 mustang with a 351w.
Date published: 2015-08-26
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Product Questions

 I have a 69 350 1W I would like to put some headers on car is all original in stock would like a little bit of good sounding exhaust would thisbe a good choice

Asked by: Joey 57
Joey, Thanks for the message. As long as your vehicle is equipped with an Automatic transmission, these would be a great choice and will give you the performance you need. Take a look at our catalog here ( for additional information regarding this header. Please let us know if you have any other questions. Best Regards, Doug's Headers Customer service team.
Answered by: Doug's Headers
Date published: 2017-04-11

I have a 69 mustang with a 351W......what H-pipe works with these headers ?

Asked by: Gregie
Gregie, Thanks for the message. We don't have an off the shelf "specific" H-Pipe to use with our D669Y headers. However, we searched across our brands and found that you may be able to modify our JBA Part #1650SH by welding the collector/reducers included the D669Y headers to the front of the 1650SH. However, the proper angles would need to be determined prior to welding. Other than this adaption of the 1650SH, a custom H pipe would need to be fabricated. We have listed some links to photos so you could get a better idea of what is involved. Best Regards, Doug's Headers customer service. D669Y 1650SH
Answered by: Doug's Headers
Date published: 2017-03-24

will this work for a 1964 ford falcon dart block with a c6?

Asked by: tonys64
The vendor has not provided any information regarding cross-fitments of this part to any other model then what is listed.
Answered by: rk cjpp
Date published: 2016-08-17

Will these headers fit a 69 torino with a 351W that has 200cfm pro-topline heads with dual bolt pattern? Also are thes available in a long tube design? Jon

Asked by: Jon69
These headers will not work for your application.
Answered by: rk cjpp
Date published: 2015-11-18

Hello. I have a 1969 Coupe Grande 351W automatic. Would these headers D669Y fit?

Asked by: Must69
Yes, they should fit.
Answered by: rk cjpp
Date published: 2015-11-02

How would these headers work on a drag race car. I think they would need a longer collector for me.  1967 Mustang, 351w , c4 trans  only have 1 5/8 on it now.  11.50 car.

Asked by: Steve306
They would work perfectly fine and would be an improvement over your current setup.
Answered by: CJPP Dave
Date published: 2017-04-29

Hi I have a 1967 mustang convertible with a 408 stroker motor ( 1969 351) Windsor block with edelbrock aluminum heads and a tremec 5 speed trans with hydraulic clutch will the tri y headers part # d669y fit my application.

Asked by: vas67
These should work fine with your setup.
Answered by: CJPP Dave
Date published: 2017-07-12

since the firing order of a 351W is different than other classic mustangs, is the tri y configuration different I presume? If so, what is the correct image?

Asked by: PLB3
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