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351 M: what to do?
#1
Another doubt I have, my friends...

My 73 was originally a 351 2V, C6 auto ( am I correct?)

A previous owner changed for a 302W, still keeping the trans.

Here, we have much more 302s available, because Galaxies and Mavericks were produced in Brazil.

The question is: I found a 351M (not a Cleveland) for sale here.

============

Is it worth rebuilding?
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#2
If the Clevelands are not available and you have a good parts supply to 351M parts. Heads and what not. Any motor can be made to run reliably.
One issue you will find is that the motor mounts are about 1-1/2"'s lower than the Cleveland. You will need to make brackets to bring it up or it will not fit the shroud.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#3
marks73;83429 Wrote:If the Clevelands are not available and you have a good parts supply to 351M parts. Heads and what not. Any motor can be made to run reliably.

{thumbs up} And the only bad thing about the 351m is the lack of preformance parts for hot rodders.
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#4
bernardopsilva;83428 Wrote:Another doubt I have, my friends...

My 73 was originally a 351 2V, C6 auto ( am I correct?)

A previous owner changed for a 302W, still keeping the trans.

Here, we have much more 302s available, because Galaxies and Mavericks were produced in Brazil.

The question is: I found a 351M (not a Cleveland) for sale here.

============

Is it worth rebuilding?
I would have to respectfully disagree.
The bellhousing is different than the Cleveland and all the other small blocks, the motor mounts are different.
The deck height is taller so the heads will be extremely close to the shock towers.
the heads are junk for any performance type builds
I would say that it is not worth putting in a mustang, Its mainly a truck motor.

[Image: mustangnight010.jpg]
1972 Mustang Convertible 351C 4V
1966 Ford Galaxie 7 litre-4speed

Jorge
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#5
The motor mount bolt pattern on the block is completely different than the Cleveland. It is a narrower mount and base. They did make a 1 year only 351M400 that had both bolt bosses in the block but they are quite rare (A lot of 4X4's scooped them for the torque).
After considering my earlier post, You can get 1 hell of a lot of horsepower out of the 302 vs the M400 due to (as Hyena429 points out) performance parts are more available and thus cheaper. But we can help you build either one and put a smile on your face. Touque vs Top End

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#6
I agree with Mark's original post. Just about any motor can be made to perform.

Here is a link to a rather in-depth article published by a "Hot Rod" Magazine build-up on a 351M/400 motor.

http://www.hotrod.com/techarticles/engin...ewall.html

This should give you some idea as to the potentialSmile.

BT

Do the RIGHT thing.
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#7
Have you considered a 351w? I had one and loved it in my 65. Tons of torque & power.

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
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#8
Don65Stang;83450 Wrote:Have you considered a 351w? I had one and loved it in my 65. Tons of torque & power.

Keep looking- Its like trying to compare a ROLEX to a TIMEX or A SPORTS CAR TO A TRUCK!Undecided
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#9
427heaven;83454 Wrote:
Don65Stang;83450 Wrote:Have you considered a 351w? I had one and loved it in my 65. Tons of torque & power.

Keep looking- Its like trying to compare a ROLEX to a TIMEX or A SPORTS CAR TO A TRUCK!Undecided

Thanks for disrespecting my opinion. I know several guys with the so called truck engine that do very well with it. Since the original poster is having difficulties finding a 351c due to his local and since 302s are plentiful a 351w can be built to perform well and use performance heads from the 302 world. Ford basically stroked the 302 block by making it a half inch taller deck. Perhaps where the poster lives the 351w may be a good option for him. I don't currently own one but was very happy with it performance wise when I did. I would rather see a 351c in his car, but given a choice between a 351m, 400m or a 351w; I'd choose the 351w truck engine every time. There are more aftermarket hop ups for it vs the other choices.

This site is about helping one another, not using all caps to shout out your opinion as being better than someone elses. There are many, many other mustang forums on the net where that's the norm. This site is not one of them but truly is the most friendly site on the net.

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
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#10
I'm begining to think the heat is getting to a lot of us! Confused
Obviously you can only build off what's available where you live. As I stated in the first post, If 351M400's are cheap and available, there are members here who can assist in making it fly as well as possible. Naturally around here in this part of the world, wouldn't be the first option. But internationally, I'll try to help a fellow member make his bicycle pedal faster! Big Grin

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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