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Rear Valance Panel Exhaust Cut Outs - Mach 1
#1
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I have always been under the impression that all 71-73 351/429 4 barrel Mach 1's came with exhaust cut outs in the rear valance panel and chrome tail pipe extensions. All of the documentation (books, sales brochures, etc) support that assumption. I am looking at a 53,000 mile original (owner claimed) 73 351 -4V CJ Mach 1 for sale. The car appears to be mostly original with many desirable options. The photo of the rear of the car though shows a standard rear valance panel (no cut outs). That, combined with a 1971 style pop open gas cap make me wonder what happened to the back of this car. I have seen a few other 351 Q code Mach 1's advertised recently that have the standard rear valance panel as well. I know Ford put together all sorts of odd combinations that were not documented but I can't believe someone who ordered a CJ Mach 1 from the factory in 1973 would specifically order the standard rear valance with no chrome pipes.

Steve
73 Mach 1 Blue Glow/Argent Q Code C6 Auto
73 Mach 1 Blue Glow/Argent Q Code 4 Speed
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#2
Here is all the info you ever wanted to know and more

"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)."

http://429mustangcougarinfo.50megs.com/
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#3
I can state DEFINITIVELY that not all '73 351C 4V Mach 1 came from the factory with the "cut out" rear valance.

I am the First and only owner of my '73 (Fire) and it was delivered without the "cut outs."

BT

Do the RIGHT thing.
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#4
Lack of cutouts MAY be a sign of a rear end collision. The damaged rear valence may have been damaged and replaced with a non cutout valence.

From my recollection, it was not unusual for STOCK 4V 351C Mustangs to NOT have cutouts.

Personally, I do not understand the allure of the cutout and visible tailpipe. To me, the tailpipe is the a..hole of the car. Why would I want to see that?

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#5
Have an extra one with duel cutouts if needed.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#6
cobra3073;78853 Wrote:I can state DEFINITIVELY that not all '73 351C 4V Mach 1 came from the factory with the "cut out" rear valance.

I am the First and only owner of my '73 (Fire) and it was delivered without the "cut outs."

BT

Thanks BT - that is pretty conclusive. So your car was delivered with dual exhausts and had the tail pipes turned downward before the rear valance? Nice to know you are an original 73 Mach 1 owner - not too many of those around!

Wolverine;78855 Wrote:Lack of cutouts MAY be a sign of a rear end collision. The damaged rear valence may have been damaged and replaced with a non cutout valence.

From my recollection, it was not unusual for STOCK 4V 351C Mustangs to NOT have cutouts.

Personally, I do not understand the allure of the cutout and visible tailpipe. To me, the tailpipe is the a..hole of the car. Why would I want to see that?

I guess that's why Ford offered Mach 1's with them and without them - to suit individual tastes. I like the looks of the chrome pipes on my Mach 1.

Steve
73 Mach 1 Blue Glow/Argent Q Code C6 Auto
73 Mach 1 Blue Glow/Argent Q Code 4 Speed
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#7
cobra3073;78853 Wrote:I can state DEFINITIVELY that not all '73 351C 4V Mach 1 came from the factory with the "cut out" rear valance.

I am the First and only owner of my '73 (Fire) and it was delivered without the "cut outs."

BT

This was specific for 71 429 cars
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#8
Yes, when I ordered my '73, there was not an option (as I recall) for cutouts.

The main selling point for me was that it was the "last year" for the Mustang as we "performance folks" understood them to be and I wanted the "best" they had to offer for that year.

BT

Do the RIGHT thing.
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#9
cobra3073;78883 Wrote:Yes, when I ordered my '73, there was not an option (as I recall) for cutouts.

The main selling point for me was that it was the "last year" for the Mustang as we "performance folks" understood them to be and I wanted the "best" they had to offer for that year.

BT

and you done well my friend
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#10
The factory quit sometime during the "73 model year using the dual cutouts. Remember, this was the last year of the original breed, so it may just have been running out of that part, and having an abundance of the non-cutout ones left. Sales were quite strong because it was the last year, so maybe they ran low and decided not to purchase both parts when one would do. I ordered mine in September and was delivered December 1, 1972. Mine came with the cutouts, and I would have been very unhappy if it had not. I really think it was a dollars and cents issues with no down side for the company. There weren't going to be any more of these (cars) anyway, so, save a few bucks. All of the Ford's energies were to get the smaller, more economical Mustang II to market.

Steve73QMach1;78801 Wrote:I have always been under the impression that all 71-73 351/429 4 barrel Mach 1's came with exhaust cut outs in the rear valance panel and chrome tail pipe extensions. All of the documentation (books, sales brochures, etc) support that assumption. I am looking at a 53,000 mile original (owner claimed) 73 351 -4V CJ Mach 1 for sale. The car appears to be mostly original with many desirable options. The photo of the rear of the car though shows a standard rear valance panel (no cut outs). That, combined with a 1971 style pop open gas cap make me wonder what happened to the back of this car. I have seen a few other 351 Q code Mach 1's advertised recently that have the standard rear valance panel as well. I know Ford put together all sorts of odd combinations that were not documented but I can't believe someone who ordered a CJ Mach 1 from the factory in 1973 would specifically order the standard rear valance with no chrome pipes.
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