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72 Mach I 351 Q-Code....what do the codes mean?

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Old 06-27-2007, 12:17 PM   #1
pramos920
 
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Default 72 Mach I 351 Q-Code....what do the codes mean?

Hello All! I'm new here and just trying to find out more info about our 72 Mach I. We purchased it from my brother-in-law around 12 years ago. He and his brother restored it, and it is in great shape. My husband said it has a Q code engine, and all the numbers match on the car...whatever that means. We are finally in the position where we canputsome money into the car, so I am trying to learn allI can. I will post a picsoon. Thanks!
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Old 06-27-2007, 12:30 PM   #2
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Where did that code come from?

According to my very old Chilton manual, there was a Q engine code for 1971 and 1973, but not 1972. 1971 Q code is 351 Cleveland4V CJ or GT. 1973 Q code is 351 Cleveland 4V HO.
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Old 06-27-2007, 01:13 PM   #3
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Sorry, I posted wrong info. The engine is a 351 cleveland cj, but the VIN has a Q. That may not have any meaning.
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Old 06-27-2007, 01:22 PM   #4
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Try this site:

http://www.mustangdecoder.com/decoder.html
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Old 06-27-2007, 01:23 PM   #5
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Welcome to the wonderful world of Mustang slang. In your VIN (Vehicle Identification Number) number (note the redundancy), the 5th character is the engine type. The 'Q' in that position for 1973 means that the Mustang originally came equipped with a 351 4V (4 barrel carburetor) High-Output engine. The 'Q' may mean different engines in different years. In 67 and 68, it was a 428 CID (cubic inch displacement) 4V (or 8V in 67) Police interceptor, in 69 and 70 it was a 428 CID Cobra-Jet. There were no Mustangs with the letter 'Q' in 71 and 72.
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Old 06-27-2007, 01:30 PM   #6
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Quote:
ORIGINAL: 66GTKFB

4V (or 8V in 67)
Jim
Jim I am confused 8v? do you mean 2v and 4v?
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Old 06-27-2007, 01:46 PM   #7
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Thanks for the info. I'll get this figured out one day....
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Old 06-27-2007, 02:22 PM   #8
66GTKFB
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

J. Patrick, me lad, the 428 in 67 was either a single quad or dual quad engine, aka 4V or 8V. It was a Shelby use and I don't know how many were equipped that way.
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Old 06-27-2007, 03:11 PM   #9
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Jim,

Cheers, got you, I never thought of 2 carbs, I thought it was unlikely a mistake as your posts are normally very informative, it is justwhenI hear 8vI think valves for 4 cylinder cars.

Paddy
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Old 06-27-2007, 04:02 PM   #10
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Hello,
I have a 1972 Mach 1 Q code, with the letter Q in the fifth position of the vin. According to the Marti Report, the car was built in October of 1971 and sold as a 1972 model. This car has the original 351Cleveland 4 barrel, Cobra Jet Engine. Everything that I have read suggests that the letter Q for the 1972 model year refers to a 351 cj as opposed to a 351 4v.The first 5 characters of my vin are: 2F05Q. The 2=1972/F=Built at Dearborn, MI/05=Mustang Mach 1 Sportroof/ Q= 351-4V CJ. The Marti Report is good for seeing the build history and all options that came with the car. The report gives other stats too.
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Old 06-27-2007, 04:17 PM   #11
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

I use the Mustang Production Guide, Vol 2 for the info. It's apparently incorrect. I found a second source that indicates the 'Q' code was used in 71 to 73 for 351 4V engines but omits the 'R' code engine, and a third that shows 'Q' engines in 71 and 73, no 72, but has the 'R' code listed for 71 and 72. Your Marti report is a pretty good authority so to you, congratulations on your 351 4V 'Q' code. I'll stick to my 65 and 66 Fastbacks.
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Old 06-27-2007, 06:27 PM   #12
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

the q code is the engine. It was called the cobra jet while the stronger engine was Called High Output. If i remember correctly the difference between the two was in the intake but i cannot recall. so if you have a q code you have a 351 Clevland with a four barrel carb(4V) I'm actually restoring a 72' q-code mach one myself. also if you go to the autoparts store such as autozone they can look up your engine by code, which is really nice because of the two differnt put into the 72..are you doing a complete tear down?
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Old 06-29-2007, 01:01 AM   #13
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Hello,
I am no expert, however Wikipedia was of great help.
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Old 06-30-2007, 11:41 AM   #14
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Not tearing the car down at all. It just needs a few things. Thanks for the info. Posted a pic in the "pics of your ride" thread.
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Old 06-30-2007, 11:57 AM   #15
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

"There were no Mustangs with the letter 'Q' in 71 and 72. "
Jim

Not sure where you got that information Jim. The Q code 351 Cobra Jet engine was available in both the 71 and 72 models.
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Old 06-30-2007, 01:29 PM   #16
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

Glen,
I know you're right, I can't find any viable back-up documentation that lists the code, the descriptive name, the displacementand the year together, and the non-Ford sources I do have are screwed up, the Mustang Production Guide, Vol 2, for one.
Jim
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Old 06-30-2007, 01:52 PM   #17
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

That's interesting. The red book doesn't show that there was a Q code in '71 but shows that there was one in '72 and '73.
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Old 06-30-2007, 02:48 PM   #18
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

One more time - well, one more.To quote 'The Official Mustang Price Guide' for 64 to 73 models, 2000-2001 edition (I don't buy these every year), there were 'Q' codes for years 69 to 73, 428 CID for 69 and 70, 351C CIDfor 71 to 73. The 71 listed at 280hp @ 5800 rpm, 345 ft lbs @ 3800 rpm, called a 'Cobra Jet' (Ram Air was code 'M', Boss 351 was code 'R'). The 72 and 73 listed at 266hp @ 5400 rpm, 301 ft lbs @ 3600 rpm. The 73 was called a 'Cobra Jet, the 72 was not listed with any special name. Note the drop in horse power in the 71 to 73 years.
Jim
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Old 06-30-2007, 04:56 PM   #19
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Default RE: 72 Mach I 351 Q-Code....what do the codes mean?

1971-72 you could opt for a Q code 351C-4v low compression Cobra Jet that only had about 280 horsepower. The 73's were even lower compression.
http://reviews.ebay.com/Ford-351-Cle...AT:-1:STORES:3
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Old 06-30-2007, 04:56 PM
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351, 351cj, 72, 73, air, cars, cobra, code, codes, engine, jet, letter, mach, mustang, mustangs, qcode, ram

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