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Old May 8th, 2010, 11:24 PM   #1
fordman390
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Default 1978 ford f-150 351M

i just bought a 1978 ford f-150 "camper special" has a 351m/400 motor and it seems extremly doggy i was wondering what i could do to get more power, or possible even switch it out for a 390 or a 460.
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Old May 8th, 2010, 11:28 PM   #2
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check the gearing. My dad had a 351M ford that was a beast till he blew it up and switched to Chevy. LOL Also he had an issue that made it not want to get up and go for crap. The stupid master cyclinder wasn't set right or something like that anyway the front brakes were too tight and wouldn't release. Changed the master cyclinder and was good to go.
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Old May 8th, 2010, 11:30 PM   #3
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headers, ditch the 2barrel and go with a nice 4. a cam, but my 400 runs like a monster with 35s and nothing but duals
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Old May 10th, 2010, 08:28 PM   #4
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Default accelerator pump

if it has a motocraft 2 barrel on it check to see that the accelerator pump is working. Usually it squirts fine the first time you step on it but when you let off the gas it returns slow, in turn when you hit the throttle again the pump hasn't had time to refill and give another squirt, however this usually leaves you with a dead spot, kind of acts like its running out of fuel, you didnt mention how many miles on it, maybe its just getting tired. if not I would check for any vacuum leaks and make sure fuel delivery to the carb isn't an issue(especially the screw in fuel filters on the front of most motocraft 2 barrels, way to small and plug with out much of anything in them)
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Old May 11th, 2010, 08:11 PM   #5
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Yea im sure its tired its 120,000 but iwas planing on rebuilding it so i was wondering if anyone gots some sugestions on how to build it, and what parts are the best parts, i dont need a hot rod , but i dont want somen with no getupngo
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Old May 12th, 2010, 07:32 AM   #6
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Quote:
Originally Posted by fordman390 View Post
Yea im sure its tired its 120,000 but iwas planing on rebuilding it so i was wondering if anyone gots some sugestions on how to build it, and what parts are the best parts, i dont need a hot rod , but i dont want somen with no getupngo
is it a 351 or a 400?

It doesn't take too much to make decent power out of a 400.

Both engines seem to run really well with an aftermarket intake maifold. We put an edelbrock single plane manifold with a 4 barrel on my buddys 400, it seemed to scream.

The biggest change in performance came from changine the gear ratio though, the truck hade 3.50 gears and we swapped them out for 4.88s
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Old May 13th, 2010, 12:14 AM   #7
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well what it says is 351m/400 and im pretty sure i found me a 351W so im just gonna put that in there instead of dealing with the modified, windsor is the way to go
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Old May 13th, 2010, 09:05 AM   #8
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well what it says is 351m/400 and im pretty sure i found me a 351W so im just gonna put that in there instead of dealing with the modified, windsor is the way to go
the M in the 351M is for Michigan Casting Center, not "modified", as opposed to 351C (clevland), or 351W (windsor)

the 351M and 400M are different engines, the 400 (6.6) is much less common
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Old May 13th, 2010, 09:44 PM   #9
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ok well wld u recomend getting the 351w instead of the 351m?

and on the motor it says 351m/400
so i unno

Last edited by fordman390; May 13th, 2010 at 09:49 PM.
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Old May 14th, 2010, 06:22 AM   #10
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for me i would stick with the stock engine, because i'm cheap and lazy

If you feel like replacing the transmission, motor mounts, radiator, lines, hoses, etc then by all means jump on it.

If i were to "build" a performance engine, it would not be the 351M, it would probably look for a 460, that way i can re-use the transmission at least, and all other 460 swap parts can be bought easily.
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Old May 14th, 2010, 08:43 AM   #11
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everything you need to know is right here http://web.archive.org/web/200712161...s/parts01.html

Last edited by ATOMIC_BADBOY; May 14th, 2010 at 09:04 AM.
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Old May 14th, 2010, 11:05 AM   #12
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If rebuilding:
Mill the heads about .030
If its a 351, get a 400 crank and 400 flat top pistons(hard to find, badger was one manufacturer)
new good timing chain
rv cam
4bbl carb

good to go.

460's are fine but more work and more expensive, different exhaust, ps pump brackets, motor mounts.
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Old May 15th, 2010, 01:02 AM   #13
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Originally Posted by fsumotorhead View Post
for me i would stick with the stock engine, because i'm cheap and lazy

If you feel like replacing the transmission, motor mounts, radiator, lines, hoses, etc then by all means jump on it.

If i were to "build" a performance engine, it would not be the 351M, it would probably look for a 460, that way i can re-use the transmission at least, and all other 460 swap parts can be bought easily.

so everything is diffrent from a 351m to a 351w? like motor mounts, and even gotta get a new transmission?

Last edited by fordman390; May 15th, 2010 at 01:09 AM.
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Old May 27th, 2010, 02:26 AM   #14
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Quote:
Originally Posted by fordman390 View Post
so everything is diffrent from a 351m to a 351w? like motor mounts, and even gotta get a new transmission?
yaa. the windsor has a sbf bellhousing pattern, and if i remember correctly the M series stuff shares the bell pattern of the 385 series big block [429,460]. very similar, if not the same. i wouldnt be sure on the mounts tho, prob different somehow
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Old October 8th, 2010, 02:32 AM   #15
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if its a 351m not a 400 go have 351c pistons fitted on the rods that would be cheaper and youll get more compression with cleavland pistons a buddy of mine mike briggs built on of these with mild cam 454 chevy roller rockers after market intake headers made over 400hp dynoed that was rwhp in a 80's bronco i think he did a little porting on the heads not sure
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Old October 8th, 2010, 12:03 PM   #16
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Quote:
Originally Posted by my broke ass ford View Post
if its a 351m not a 400 go have 351c pistons fitted on the rods that would be cheaper and youll get more compression with cleavland pistons a buddy of mine mike briggs built on of these with mild cam 454 chevy roller rockers after market intake headers made over 400hp dynoed that was rwhp in a 80's bronco i think he did a little porting on the heads not sure
hm, never heard of using the cleveland pistons before, nice.
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Old October 8th, 2010, 08:17 PM   #17
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hot rod mag did a pice on this to theres alot of hp to free up in these motors
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Old October 8th, 2010, 11:00 PM   #18
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Quote:
Originally Posted by fsumotorhead View Post
the 351M and 400M are different engines, the 400 (6.6) is much less common

Actually both the 351 and 400 are identical in every aspect except the rotating assembly. And the "m" in the designation doesn't have a clear meaning, it could me modified, or michigan but the michigan part doesn't really hold water since they were quite a few of these engines built in the cleveland plant. Also, just a little tidbit the "m" engines actually belong to the same engine family at the cleveland's (fords 335 series engines).

Aside from buying motor mounts and an oil pan kit there isn't a whole lot to putting a 385 series engine into a vehicle that had an "M" engine to start with. You can now find the mounts for less that $50 on ebay and they are identical to the mounts I paid over $150 for when I did my swap. The p/s pump bracket can be modified to work on the 460 without much issue. The main benefits of doing the 460 is more HP and TQ with a budget build and an almost unlimited amount of aftermarket support and upgrades. There are many many stroker kits, head options, intake and header options, and other performance parts for the 460. And from a budget build stand point wont cost much more to build than the 351M (except the cost of buying the 460 core).

When I did mine I went for the 460 and never looked back and I love it. Mine is a very basic build with nothing fancy. Bigger cam, reworked stock D3 heads, flat top pistons and an edelbrock performer intake and 750 cfm carb. I have excellent low end torque and a reliable, durable engine the does everything I every ask of it. Flat out the M engines don't hold a candle to the 385 series what so ever.

Like they say "THERE'S NO REPLACEMENT FOR DISPLACEMENT"

Also, here is some good info on the 351M/400 boat anchors http://www.projectbronco.com/History..._ford_351m.htm
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