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Mine's an "M" code
#1
is that really bad ???  Huh  can I improve my M code?


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#2
Huh  do M code suck?...everyone seems to have a "Q" or "J" code or sommat posh

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#3
Nothing wrong with M code.
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#4
runninpony 
A,B,C or F...it don't matter!  Tongue

71-73 Mustangs never die, they just go faster!
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#5
"M" Codes! Absolute DO NOT SUCK!! The 1971 351C "M" code is the very best engine short of the Boss, which is basically the same, only a few tweaks and a few better parts.
The advertised compression ratio is 10.7:1 with Closed Chamber Quench heads at approx. 63cc volume. The valves are freakin huge, 2.19" inlet 1.71" exhaust
Earlier '70 heads are rated at 11:1 and 62cc volume. These are D0AE-N. Mine are D0AE-GA which are a bit later, cast in Dec 1970.
Deck height is .028" with a .039" compressed head gasket.
What you are reading is a lot of the members own 72 or 73 cars. The 4V was called a "Q" code, but the compression ratio was on a downslide from early 72 to the end in 73. The "H" code was the 2V engine.  The "J" or "C" code was the 429.
DO NOT mistake the 74 351M engine. These are NOT the same at all and are a POS! Truck motors!!
Hope that clears up what you have. Very easy to do research on the web, but be cautious, lots of misleading stuff out there.
www.Mustangtek.com is good for researching casting numbers. also www.351C.net (another forum), very useful, but...…..
ENJOY your "M" code!!
Geoff


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#6
"M" code is good. Plenty of power stock, doesn't take much to bump up the horsepower. If you want a lot of power, easy to stroke it to 408 cubic inches.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#7
(01-22-2019, 01:15 PM)Don C Wrote: "M" code is good. Plenty of power stock, doesn't take much to bump up the horsepower. If you want a lot of power, easy to stroke it to 408 cubic inches.
+1
408 strokers with 4v heads (M408) can produce monster power.

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1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump
Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes
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#8
M code is fine for sure. Is your car a sportsroof? Maybe with the chrome rocker trim.
Welcome to the forum from N.C..


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#9
(01-22-2019, 01:41 PM)Carolina_Mountain_Mustangs Wrote: M code is fine for sure. Is your car a sportsroof? Maybe with the chrome rocker trim.
Welcome to the forum from N.C..

 If you were not aware, David is referring to a car with a VIN of (for a 71) 1f02M XXXXXX i.e. sportroof. The Boss would be 1f02RXXXXXX The Mach 1 would be 1f05MXXXXXX. which is probably what you have. In this case "f" means it was built in Deardorn. If it's a "t" it was built in Metuchen. 02 =Sportroof, 05= Mach1,
If you don't yet have one, you can get a "Marti Report" from www.martiauto.com It will tell you all about YOUR car.
Geoff.

I learn something new every day!
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#10
71-72 CJ was a better performance package than the M code. Ford made lots of mistakes with the 70-71 M-code drivetrain setups and fixed it in May of 71 with the Q code.


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