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Old Sep 5, 2011 | 04:05 PM
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somthing dont add up

ive got a 78 f350 dually with what im sure has a 351/400m in it(based on pics ive found here)however when i check the vin decode it says its a 351 windsor.either way im good with what its got.next question is which is the better motor the 351m or the 400.thanks in advance.
 
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Old Sep 5, 2011 | 04:13 PM
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Can you post up your full VIN? 351w was not at option so I'm curious to see now you are coming up with that.
The 351m and 400 are basically the same thing other than stroke. In my opinion, if you are going to have one or the other than you might as well go with the extra cubes.
 
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Old Sep 5, 2011 | 04:18 PM
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im with you on the cubes

heres the vin...f37hcce3993
 
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Old Sep 5, 2011 | 04:23 PM
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Well that VIN isn't coming up as a good VIN for me on the site decoder but I can tell you the 4th digit being an "H" is a 351m. Same as what my 1977 had.
 
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Old Sep 5, 2011 | 04:25 PM
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checked again

and all its says is 351cid,my mistake on the winsdsor part.
 
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Old Sep 5, 2011 | 04:27 PM
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The Cleveland was discontinued from Ford truck use after 1974. You are correct you have a 351, it is 351 modified. Also known as the 351m. I also confirmed this with my literature and it confirmed it.

I have both engines, and they are impossible to differentiate between them, as they only differ in stroke.
 
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Old Sep 5, 2011 | 04:43 PM
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thanks for the help

gotta get rid of this one so i can spend on the 76,just wanted to be as sure as possible about what i had.
 
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Old Sep 5, 2011 | 09:20 PM
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F37HCCE3993
F37= F350 cab and chassis
H= 351 cu in 2bbl V8 engine
C= Ontario truck assy plant
CE3993=1978 model year sequential serial number
 
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Old Sep 5, 2011 | 10:13 PM
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a 351m is just a destroked 400, in my opinion a good motor but i feel its just holding back power.
 
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Old Sep 6, 2011 | 08:51 AM
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I'm not sure that M means Modified I thought it was MILAN,MI as C is to Clevland OHIO, asW is to winsor Onterio Just my thought, If Im wrong it want be the first time
 
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Old Sep 11, 2011 | 03:55 PM
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Originally Posted by toymobile
I'm not sure that M means Modified I thought it was MILAN,MI as C is to Clevland OHIO, asW is to winsor Onterio Just my thought, If Im wrong it want be the first time
Ford never disclosed what the "M" stood for, despite all the rumors. To this day no one has been able to produce any actual Ford literature stating otherwise.
 
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