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Old September 23rd, 2009, 03:26 PM   #1
lososjoyride00
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Default 351M... worth a crap

have been looking for a swap motor for my jeep. my friend has a 351M with 35000, has everything with it, heard the engine run, and sounds great. i had one in my old bronco, and it ran good, but seemed pretty underpowered. ive heard they are heavy turds, and not worth messin with. would like to hear some opinions, suggestion, information on these.
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Old September 23rd, 2009, 06:53 PM   #2
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I guess theres worse engines but I can't think of any right now...Just kidding. its not a bad engine if you like low revs and high torque. the one thing you can do to bring it to life is add a decent cam. something made for hauling or trailer towing that makes torque. these engine do not like being reved like a small block . as for weight its around 600lbs for the engine. a small block chevy or 351 W would be around 540 lbs. so its a very doable set up. you should do your home work on after market parts if you intend anything like headers and such. they maybe hard to find.
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Old September 23rd, 2009, 07:06 PM   #3
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i have played with the 351m ford engine a little in the last few years.
the 351m is a fairly low horse power engine when in stock trim. they have some ok torque at fairly low rpm, that is good. unless it was real cheap id pass on it. if you wanna run it stock its not great. if you were gonna rebuild it with some performance parts it could work.
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Old September 23rd, 2009, 08:08 PM   #4
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i'm not sure but my friends 351m in his 79 bronco is bad ass i know there has been some engine work done but dont know what, as said before these are great motors for low end torque
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Old September 23rd, 2009, 08:45 PM   #5
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im gettin the engine, and c6 with t case for $300. maybe for right now ill put it in with a intake, carb, ignition, and a little later, pull it and rebuild it with some goodies. unless someone else has a better motor for sale for cheap?
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Old September 23rd, 2009, 08:56 PM   #6
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You need higher compression and a different cam to wake the engine up. Swapping the crank and rods out to make it a 400 is the way to go. Try and find some badger flat top pistons. You can dink around with bushing cleveland pistons to work with the 400 rods if you can't find them.
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Old September 24th, 2009, 03:45 AM   #7
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I agree with the above post. They have to low compression in stock form and the heads have very good {big} flowing ports that will make em kinda lazy.....until you up the compression and put a modern camshaft in it.

If you happen to catch any Popular Hot Rodding mags with their Engine Masters articles you will see the past few years the 351m/400m combo has been the engine of choice for most top builders and has made sic power!
I love to have one someday to play around with myself after I use up all these dam 5.0 parts I have layin around.
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Old September 24th, 2009, 04:22 AM   #8
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I wonder how much you can shave off the heads on a mill? I know we took .125 off a set of 429 heads and they held up fine.
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Old September 24th, 2009, 10:34 AM   #9
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Quote:
Originally Posted by TurdBronco View Post
You need higher compression and a different cam to wake the engine up. Swapping the crank and rods out to make it a 400 is the way to go. Try and find some badger flat top pistons. You can dink around with bushing cleveland pistons to work with the 400 rods if you can't find them.
i definatly agree but,

if you put an aftermarket intake and carb on it they run pretty well, the stock manifold and the 2150 carb just don't work great for making much power
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Old September 24th, 2009, 10:47 AM   #10
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I ran one a few years back, and the engine was ok, but I put a 2800-3200 stall convertor behind it, and it helped a lot.
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Old September 24th, 2009, 11:09 AM   #11
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If you are going to build it make it a 400. I ran one years ago with a Sig Erson TQ20 cam Edelbrock performer intake and a B&m torque plus converter in a 4WD 78 F150 stepside from 0~100 it would eat up IROC's & 5.0 stangs. IIRC the 400 I started with was a 71 and it was 9:1 compression all of the ones after that were 8:1
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Old September 27th, 2009, 06:57 PM   #12
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First thing to do is new chain and gear set. Timing is way retarded. Next cam, after that is intake and carb.
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Old September 28th, 2009, 08:48 AM   #13
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you can get cheap longtube headers from summit for 100 bucks that will give you some more tourqe
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Old October 12th, 2009, 07:54 PM   #14
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I got a 351M in the 79 F150 i just bought. I got a 400 in my 78 1 ton.

There good motors, make sure yours isnt an early casting 351M (before march of 77 i wanna say) they had block cracking issues.

They are similar to a big block, lots of low RPM torque, not much up high, and drink fuel like its going outta style. They do decent for what they are, in something light like a jeep it should be a good upgrade from im guessing a 4.0L I6. They behave alike, low RPM grunt and lots of it.

The best thing you can do to a M is put in a cleveland timing set. My 400 in my 1 ton has a cam, early timing set, 4bbl 650 edelbrock, hooker header, edelbrock intake, and some other goodies, it runs HARD. The 351M in my 79 is just stock, it runs smooth and should do the job, but its not an all out torque monster like the 400.
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Old October 12th, 2009, 08:25 PM   #15
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another thing to do is run an external oil line, they have oil sending problems, you can find out to do the external oil line easy with an internet search, when i had my 78 bronco, it had the 351M in it, did everything i wanted it to do. agree with all of the above: do oil line, timing set, cam, bore it out and put a 400 crank in it, and 4brrl intake and carb and you'll be very happy. even in stock form i'm sure you'll be happy as well, i was and mine just had the stock 2 brrl on it.
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Old October 12th, 2009, 09:47 PM   #16
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What kind of oiling problems?
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Old October 12th, 2009, 10:18 PM   #17
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get it & throw the heads on a 351 Windsor roller block That will wake it up. low end tq & high end rpm's

I have some CLEVOR manifolds NIB. Old school stuff/
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Old October 13th, 2009, 09:42 AM   #18
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Quote:
Originally Posted by BIGBADCJ5 View Post
get it & throw the heads on a 351 Windsor roller block That will wake it up. low end tq & high end rpm's

I have some CLEVOR manifolds NIB. Old school stuff/
your a fuckin idiot

windsor and modified motors are not interchangeable.
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Old October 13th, 2009, 07:38 PM   #19
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289 heads will wake a 351 WINDSOR up.

However, 351 Cleveland heads should work on a Modified.

You could remachine M heads till theres nothign left and they wouldnt fit a windsor.
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Old October 14th, 2009, 10:29 PM   #20
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you just need my 460 lol
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