351 and 400 in the fullsize bronco 78/79 - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-16-2006, 05:23 PM   #1 (permalink)
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351 and 400 in the fullsize bronco 78/79

so my daily ride is a toyota cab on a 78/79 bronco frame...and supposedly its a 400 in there...i wouldn't know the difference...well the motor went out on me and i have a rebuilt 400 lined up to put in there. My question is since broncos came with the 400 and 351, for FORDs sake...that 351 would be the M version correct, so that they wouldn't have to run all different c6's in there?? is this correct.

I just want to know that if my "400" that let go was really a 351...that its not a C or W, but a M...and when i put this 400 in, its a direct bolt up...
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Old 02-16-2006, 05:31 PM   #2 (permalink)
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if it is stock it is either a 351M or a 400. the motors look the same so you should be able to do a quick look and tell. I think the only difference in the two is some internals. if they told you it is a 400 then I would bet it is at least a 351M so you should be good to go.
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Old 02-16-2006, 05:34 PM   #3 (permalink)
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im not too worried about the motor im getting...hes a ford guy so i trust its a 400, im just worried about my end...since im new to fords, theres soo many different versions and such...i just wanted to make sure that it was either a 351m or 400 in my fordyota...so that this 400 is a direct bolt up.
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Old 02-16-2006, 05:40 PM   #4 (permalink)
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don't worry I think you will be in good shape
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Old 02-16-2006, 07:18 PM   #5 (permalink)
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351 Modifieds, Clevelands, 400s, 429 and 460 motors all use the same bell housing and can use the same tranny.
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Old 02-16-2006, 07:59 PM   #6 (permalink)
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count your valve cover bolts. 351m.400's have 8 bolts, 351w has 6 and big blocks have 7./
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Old 02-16-2006, 09:39 PM   #7 (permalink)
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the crank and pistons are the internal differences.
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Old 02-17-2006, 02:16 AM   #8 (permalink)
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Quote:
Originally Posted by GMCTruxrule
351 Modifieds, Clevelands, 400s, 429 and 460 motors all use the same bell housing and can use the same tranny.

460 + 400 bell housing = bad times. they use the same bolt pattern but IIRC the 460's is a little taller then the 400. ive had plenty of people tell me not to use my stock 400 bell on the 460 swap.


as for your new motor, just rip out the old one and drop the new on in, chances are itll bolt right up, if not youill have to spend a bit more money
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Old 02-17-2006, 04:38 AM   #9 (permalink)
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Everything is the same externally between the 351m-400, unbolt, bolt up, and your running
BTW- They Are decent motors with a cam swap, intake, and headers.


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Old 02-17-2006, 06:36 AM   #10 (permalink)
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Quote:
Originally Posted by NetBSD
460 + 400 bell housing = bad times. they use the same bolt pattern but IIRC the 460's is a little taller then the 400. ive had plenty of people tell me not to use my stock 400 bell on the 460 swap.
=good times for me, 390 flywheel, 400 12" clutch, no problems
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Old 02-17-2006, 08:06 AM   #11 (permalink)
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Quote:
Originally Posted by BUZZISCRAZY2
Everything is the same externally between the 351m-400, unbolt, bolt up, and your running
BTW- They Are decent motors with a cam swap, intake, and headers.


Buzz
yeah there was a link to some guy Tim Meyers that is a ford motor builder and he said flatops,cam,some head work and its a real good motor.


So, whats the deal with people saying i have a 351modified400...is that just b/c they are so alike its either or??? What are the differences in numbers on these two stock...hp/torque...are they pretty even?
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Old 02-17-2006, 08:23 AM   #12 (permalink)
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Ford's official designation of the engine 'family' is: 351m/400. Some folks confuse the family with the particular engine displacement. Us 400 builders joke about that common mis-statment as the elusive "variable-displacement' motor.

The 400 was actually the last pushrod engine Ford ever designed, based on the 351C Cleveland but with numerous changes to the block configuration (crank main journal size increased, taller deck height and 385-series bell-housing pattern. The 351m is simply a 'quick and dirty' Ford response, later on, to the smog-driven need for a smaller displacement engine that fit in the same place as a 400..so all they did was de-stroke the 400 one-half inch and cast up some funky tall pistons to make up the difference. Unfortunately, that 'patch job', combined with the 70s-era smog equipment and smog detuning, resulted in the 351m being a pretty lame, albeit very reliable, motor

Due to the large difference in stroke, the 400 has much more torque potential than the 351m, all other things being equal. Sadly, only the very first year of 400 production were offering decent perfromance 'out of the box'. Fortunately, all 351m and 400 engines can be easily returned to the intended level of performance the designers had in mind in 1970.
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Old 02-17-2006, 03:00 PM   #13 (permalink)
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the 351M is hard to kill...my friend is running out with around 300K and it runs with almost 0 oil pressure. the one I had in my trail truck took alot of abuse...even running dry on its side while I was trying to drve myself out of a roll over.
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Old 02-17-2006, 05:18 PM   #14 (permalink)
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Quote:
Originally Posted by GMCTruxrule
351 Modifieds, Clevelands, 400s, 429 and 460 motors all use the same bell housing and can use the same tranny.
Close but no cigar.
Tha 351C does not share the same bellhousing as the 351M,400, and 460 do.
When Ford made the 400 and then the 351M they changed the deck highth so it would use the same bell housing as the 429-460. How do I know well I tried putting a 351C in place of a 400 needless to say I learned that one the hard way.
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Old 02-17-2006, 06:43 PM   #15 (permalink)
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Quote:
Originally Posted by GMCTruxrule
351 Modifieds, Clevelands, 400s, 429 and 460 motors all use the same bell housing and can use the same tranny.


As said before the 351C's do not have the big block bolt pattern, how ever some of the very early 400's had both big and small block patterns casted in the blocks.
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