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351 Cleveland Cobra Jet Valve Covers
#1
I brought my 351 Cleveland motor out of my 1971 Mustang Mach 1 to machine shop over the winter. After tearing apart and looking at numbers it ends up being a 351 Cleveland Cobra Jet! In looking into it more it looks to be the original motor that came with this mustang. First of all I’m looking for set of Cobra Jet Valve Covers like the picture attached, I can’t seem to find them anywhere to order? Anyone have any idea on where to get similar ones?
Also anyone have any insight on how to verify 100% that this is original motor with this car. In my research very few Mach 1 came with 351 CJ 4V. Thanks for any help. [Image: ff4d54a1e17a8ab754c1e3faa4bb4deb.jpg]


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#2
Couple things.

The Cobra Jet name was not used in 71. It was the 72 & 73 moniker for the 351 4v motors with open chamber heads.
What is the engine code in your VIN number? Should be like this 1F05 then next letter would designate what engine it came with. In 1971 would be L, M, H, R, F, C, J
Break down as follows.
L = 250 I6
M = 351C 4V Closed Chamber heads
H = 351C 2V
R = Boss 351
F = 302 2v
C = 429 Cobra Jet
J = 429 Cobra Jet w/ Ram air

To further verify if the engine block you have is original to the car the last 6 digits of the VIN is stamped in the block on the upper back of the drivers side.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, 750 CFM double pumper, Holley Street Dominator intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#3
If it is the original engine the last 6 digits of the VIN will be stamped on the block
Drivers side at the back right below the head
It should read 1 for 1971, then F or T depending on the plant your car was built at, then the last 6 of your vin

Yes there were 144 Q code 351 4 V's in late 71

Ohio Mustang Supply
440-949-2556

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#4
About 144 1971 Mustangs were produced, late in the production run, with the 351 CJ/engine code Q. Chuck
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#5
(04-02-2018, 09:28 AM)73pony Wrote: Couple things.

The Cobra Jet name was not used in 71. It was the 72 & 73 moniker for the 351 4v motors with open chamber heads.
What is the engine code in your VIN number? Should be like this 1F05 then next letter would designate what engine it came with. In 1971 would be L, M, H, R, F, C, J
Break down as follows.
L = 250 I6
M = 351C 4V Closed Chamber heads
H = 351C 2V
R = Boss 351
F = 302 2v
C = 429 Cobra Jet
J = 429 Cobra Jet w/ Ram air

To further verify if the engine block you have is original to the car the last 6 digits of the VIN is stamped in the block on the upper back of the drivers side.


I have the M code and see pic below it shows it came out in late 71?
[Image: 33b51f2c86cce139d4ca4db843c23f53.jpg]


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#6
Ok. so if you have the M code you don't have the Q code (cobra Jet). I did not realize that there were a few Q codes made in late 71. Frankly the M code is a better motor than the Q, the M has the closed chamber high compression heads. the Q would have low compression open chamber heads.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, 750 CFM double pumper, Holley Street Dominator intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#7
And I believe the valve cover shown is a windsor head. Let's see how this plays out on photos from OP and comparison of VIN to motor (by looking at date codes).

Mark
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#8
(04-02-2018, 10:15 AM)SVO2SCJ Wrote: And I believe the valve cover shown is a windsor head.   Let's see how this plays out on photos from OP and comparison of VIN to motor (by looking at date codes).

Mark

Correct. There are not enough holes in that valve cover for a Cleveland.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, 750 CFM double pumper, Holley Street Dominator intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#9
Ok I was just looking to put these on to show off motor little bit. I will check #s, will be interesting because the hood has Cobra Jet decal on it also. So I’m really confused now. Thought the dots were starting to connect maybe not


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#10
endroman, as Don posted, you can check on the  left rear of your block right below the cylinder head. If original to your car the last six digits stamped should match your vin.
Agree with Mark, the valve cover pictured is a Windsor (302, 351W) valve cover which takes six bolts. The Cleveland style took eight bolts and also fit the Boss 302, 351C, 351M and 400 engines. If looking for a similar style valve cover you need to check the FRP (Ford Racing Parts site-formally SVO). I don't have my FRP/SVO catalogs with me to see if that was something offered in the past. https://performanceparts.ford.com/catego...alveCovers
The Ford engine listing you posted keeps on appearing on different sites with mostly correct info. 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.
Not the end of the world if you don't have one of the original 144 71 "Q" code Mustangs, unless you have a strong desire for something rare! As Jason said, the 71 M has the desirable "Quench" cylinder heads and was more than capable of holding it's own against just about anything that wanted to try you!!

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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