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All 71 429 Mustangs came with dual exhaust. If a 429 CJ/SCJ was ordered in a Mach 1, it received the chrome exhaust tips and the rear valence with the cutouts. It is probable that all other non-Mach 1 Mustang models were intended to get the turn down, non-chrome exhaust without cutouts in the rear valence (however, several factory exceptions to this have been found).

(Note: Click thumbnails to enlarge pictures.)

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Exhaust Manifolds

The photo at left shows the 71 429 CJ Mustang/Cougar exhaust manifolds. Note that the 71 429 Mustang/Cougar has a unique driver side manifold that is a different design from the exhaust manifold used on the 70 - 71 429 CJ Torino. The photo at right is a side by side comparison showing how the Torino manifold outlet points upward while the Mustang version points downward. This is done to avoid the steering gearboxes in each vehicle. The 71 429 Mustang/Cougar however, does use the same passenger side exhaust manifold as the 70 - 71 429 CJ Torino.

Note that from the factory, no gasket was used between the exhaust manifold and the head. However, older parts may not be as flat as the originals and the gasket would be good insurance against exhaust leaks.

The unique Mustang/Cougar-only driver side manifold has two possible cast in part numbers;
D1ZE-9431-CA1 or CA2. Note that some parts books also show the D1ZE-AA as also being a driver side 429 CJ/SCJ, but this is incorrect - this part number is actually for a 351 C).

For the passenger side, the part number is D0OE-9430-A.  Location of the cast in part number is shown below along with examples of both a CA1 and CA2 Driver's side manifold;


         lifthookpassSide.jpg (76650 bytes)    

Exhaust Manifold Heatshield

The correct shield for the 71 429 Mustang/Cougar is shown in the photos at left and center (installed). This is a very hard part to find today because most of these shields rusted away years ago. The photo at right shows this shield compared to other 429 shields that frequently show up on E-Bay as being correct (but are not) for the 71 429 Mustang/Cougar. The photos below left and center show the studs used to attach the shield. Note that this same shield is also used on the 70 - 71 429 CJ Torino. The photo below right is just for fun - it is rare enough to see one of these shields - three together is extraordinary.

The service part number for this shield is D1AZ-9A603-B.



Donut Gasket

These metal rings are the "gasket" used between the 429 CJ/SCJ exhaust manifold and the exhaust system. One is used on each side and they measure 2 3/8" at the ID, 3 1/16" at the OD and are 3/4" thick. They are getting difficult to find for the 429 CJ/SCJ.



The photos above are of what we believe are original 1971 429 SCJ Mufflers bearing the part numbers D1ZA-5232-BC and D1ZA-5230-EB. A set of original muffler hangers are below at right as well as installed views.

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hpipe5.jpg (73915 bytes)    hpipe6.jpg (69461 bytes)    hpipe7.jpg (73978 bytes)    Hpipe3.jpg (145351 bytes)

429 H Pipe

These pictures show an original 429 Mustang H pipe. Below is an installed view showing the flattened sections (presumably to meet vehicle ground clearance requirements).

hpipeflattened.jpg (67300 bytes)


Exhaust Systems

An NOS system for a 71 429 CJ Mustang is shown above (courtesy of Bob Perkins E Bay auction). Bob's auction comments about the system are below;

"NOS 1971 Mustang Mach 1 muffler assembly's for 429CJ. Ford part numbers D1ZZ-5230-F,J. Both mufflers have the Ford oval and engineering number in the muffler. Note the stop/alignment tab on the tail pipe. This is the reason for left & right chrome tips with unique part numbers from Ford."

ExhaustsystemCougar.jpg (74475 bytes)

A system from a 71 429 Cougar is shown above.


Tail Pipe Hangers

Above are shown the correct 71 Mustang tail pipe hangers used on both 351 (dual exhaust) and 429 applications. An installed view is shown at top right. Below is a close up of the hook at the top of the
bracket where the bracket bolted to the car frame. There was a hole in the vehicle frame and the hook went into the hole to locate the bracket. 


exhausttips1.jpg (30159 bytes)  TipAA.jpg (8934 bytes)   tipBB.jpg (10155 bytes)   Tips.jpg (10312 bytes) 

Exhaust Tips

These are the chrome exhaust tips that came on 429 Mustangs (Part # D1ZA-5202-BB and  D1ZA-5203-AB). The original right and left exhaust chrome tips, and their original tail pipes, had indexing features on them so that just the right hand chrome tip fit on the right hand tail pipe, and the left hand tip fit only on the left side. This was done so that the tailpipes clamp screw point, pointed away from the gas tank and not towards it. Original chrome tips were a right and left assembly, and had two different part numbers because of this.

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Correct Exhaust Tip Positioning

We believe the positioning of the chrome tips shown in the photos above is the correct factory location. They are close to the valence cut-outs at the tops and sides of the tips.  Also, the length of the tip sticking out beyond the valence is correct too.

tips3.jpg (18162 bytes)   valencecomparison.jpg (50077 bytes)

Rear Valence

The photo at left shows an installation shot of the chrome exhaust tips used on the rear of the Mach 1 with the special rear valence with cutouts. The photo at right compares an original valence to a repro.


Johan Lindvall's 429 SCJ Mach 1