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1971 M codes to Q codes
#1
Does anyone know if the M codes were built to a certain date in 71 and then the 1971 Q codes were produced? 
Saw this post in another forum and it peaked my interest.

".. All my sources say that the lower compression 4V motor was introduced in May of 1971 and it was called the 351 CJ. I have seen where this motor was listed as the Q motor ( Q code) Now my main question is... Did they continue with the M code to finish out the year or did they end it right there in May of 1971? ( and from thereon out install CJ motors..) From what I gather the higher compression engine goes by the term 4V and the lower compression goes by CJ ( or cobra jet) How can I tell what I have? My VIN states M code. Could I have one of the last true M codes made? It was built on May 28th, 1971..."

Ray

1971 Boss 351  
1972 Q code 4 speed convertible 
1971 Mustang Sportsroof  351-2V FMX 
1973 Mach 1 (parts car)
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#2
Ray, there seems to still be some confusion over these two engines. I believe it may be a WIKI listing that has some incorrect info and is causing the confusion. The 429 listing is also not spared from the wrong info. Ram air was a $65.00 option on the M and that did not make the M into a Cobra Jet. The 71 351CJ (code Q) DID NOT replace the 71M. The 71 Q was a April 71 release and was an optional engine along with "M" that remained in production till the end of 71 production. I have a late build 71 Mach 1 (7-28-71) that has the M code 351C.
I believe the April 71"Q" 351 was just a test run for Ford. All the manufacturers knew that stricter emissions and safety laws were on the horizon and and most of the 71 engines in their present configuration could not meet those new requirements. This engine was just a sign of things to come.
As safety and fuel mileage started to take center stage, the word performance was starting to become just a word in the Dictionary. Even the word Cobra Jet disappeared from the air cleaner lids and window stickers sometime in early 72. Ray, I know you tried to pin down exactly when that took place but I believe we never did get a good enough cross section of early Q codes to do so.     Smile

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
[+] 1 user Likes secluff's post
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#3
Secluff (Steve) - excellent info (as I have come to expect from you!!!) Thanks for that.

Not positive, but from what I have pulled from many old Marti reports - last day of 1971 Mustang production was some day in the first week of August 1971. Very tough to nail it down but you know I am trying!!

BTW if anyone has a collection of old Marti reports - please email them to me PLEASE! Send to Boss1Ray@cox.net I really like early and very late production cars. But ALL are appreciated! If you have a LOT (like DON LOL) please contact me to arrange an online repository to make the sharing easier!

I will continue to share what I am able to discern from all them on this site! The more the better!!! Don't worry about duplicates - I can sort!

Ray

1971 Boss 351  
1972 Q code 4 speed convertible 
1971 Mustang Sportsroof  351-2V FMX 
1973 Mach 1 (parts car)
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#4
Steve, You are the Yoda of all things vintage Ford. Thank you, Chuck
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#5
ANYTIME you have a question like that I would pay for the Ala Cart Question option for Kevin Marti Auto. (Used to be $5)

Warning you have to know HOW TO POSE A QUESTION!! In this case, if you asked "what was the last day a 1971 M code mustang was built?" that may not tell you the last car RELEASED (from building)

Mark
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#6
There were for sure some odd combinations in 71 for the M & Q cars. I turned down the Mach 1 M last year I should have got that was a vinyl roof car.
They only made 1 yes one M code Fastback or Mach 1 with a C-4. There was also only 1 one Q code 4 speed convertible. So there are two that you need to watch for. There was only a total of 154 Q codes made in 71 so about any model Q is a find. Pulled info from Marti's book.
David


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#7
Dont trust that C4 info. But the one H code 4 speed vin was the number used to hide the 71 Boss 302 car.
There is a bunch written on here about that car. It recently sold to Bob Perkins. (almost said Bob Beers - HO slot car collector like me).

Ray

1971 Boss 351  
1972 Q code 4 speed convertible 
1971 Mustang Sportsroof  351-2V FMX 
1973 Mach 1 (parts car)
  Reply
#8
Just a side note on Ford engines and production dates.

As collectors or restorers we'd very much like to have  firm start and stop dates for Ford engines, but in my experience that's a unicorn.
Back before Marti Auto Works had access to as much Ford data as they do now, I was researching my 1974 Grand Sport Torino. The engine was in fact a CJ although however the there supposedly no CJ engines built in 1974.

Somewhere I have more of the data, but the short version of the story is that records were found that suggest that around 400 CJ engines were build in 1974 and one found it's way into this Torino.

Tim

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
  Reply
#9
Tim, I don't know where the "Experts" are digging up all this flawed info we're being fed! The no 74 Q engine seems to resurface occasionally. Although it had lost most of it's bite and was more gum than teeth, the Q engine was very much part of the 1974 engine line up. It was available in the Gran Torino, Mercury Montego, new full size Cougar, Pantera, and the Torino "Trooper" Police package. For what ever reason it was never released for the Gran Torino Elite.
With very strict emissions laws now in place and emissions compliance testing very expensive, anything produced in just a few hundred would have never been approved by the "Suits". EVERY engine, transmission, and differential combination had to be tested. Very expensive and time consuming for the manufacturer. That's why as the years went by you saw less engine, transmission and rear gear options and things like ram air disappear from the option list altogether.
The 74 Gran Torino Sport was a nice car. I had looked at them but just could not give up my 72 Sport at the time. They ran one more year but only sold a little over 5,000 of them so they were discontinued in 76. Really hated to see the Sport disappear, it arrived wrapped in a beautiful fastback body with big blocks and CJ engines and left with three engines with less horsepower than today's 6 cylinder Mustang!

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
  Reply
#10
(04-29-2018, 10:58 AM)secluff Wrote: Tim, I don't know where the "Experts" are digging up all this flawed info we're being fed! The no 74 Q engine seems to resurface occasionally. Although it had lost most of it's bite and was more gum than teeth, the Q engine was very much part of the 1974 engine line up. It was available in the Gran Torino, Mercury Montego, new full size Cougar, Pantera, and the Torino "Trooper" Police package. For what ever reason it was never released for the Gran Torino Elite.
With very strict emissions laws now in place and emissions compliance testing very expensive, anything produced in just a few hundred would have never been approved by the "Suits". EVERY engine, transmission, and differential combination had to be tested. Very expensive and time consuming for the manufacturer. That's why as the years went by you saw less engine, transmission and rear gear options and things like ram air disappear from the option list altogether.
The 74 Gran Torino Sport was a nice car. I had looked at them but just could not give up my 72 Sport at the time. They ran one more year but only sold a little over 5,000 of them so they were discontinued in 76. Really hated to see the Sport disappear, it arrived wrapped in a beautiful fastback body with big blocks and CJ engines and left with three engines with less horsepower than today's 6 cylinder Mustang!

Was the 429 CJ made in 1974?

Thanks

Tim
Tucson, Az
1973 SportsRoof
351C bored .040
Crank .020  and Stock cam
Flattop pistons
Edelbrock 4bbl CARB 800 CFM ELEC CHOKE
Edelbrock Performer 2750 Intake Manifold

[Image: NewPrimedHood_zpsw2jaj0cu.jpg]
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