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Old 02-26-2014, 01:21 PM   #1 (permalink)
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351M, what are some tricks to this motor

I have been a ford fan since I was a kid but have always loved the Jeeps as well. I am putting together a new Juggy with a Ford drivetrain, jeep front clip, tube frame, etc. I picked up the donor truck a few weeks ago and I need some advice on the motor. Donor is a running 78 F250 snow fighter with 351M, NP435, NP205 D60s front and rear. Truck has 58k original miles on it but the body is trash.

What are some chep tricks to wake this motor up? I am pulling the motor and going to run through it quickly, clean it up, paint it and get it in the Juggy. Unless I find reasons to rebuild it. I hope not, cause I am trying to keep the drivetrain price down since I am trying to not have to sell my CJ to fund this project. Wife is not excited about new project. What cams does this motor like? Oiling tricks to look for? What should I not waste time on? Let me know your thoughts. Thanks.
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Old 02-26-2014, 01:35 PM   #2 (permalink)
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i have some parts you could use
i rebuilt my 351m i put a 4 bbl intake on it
did a bunch of head work
roller rockers crome moly push rods and rv cam
cross drilled the crank for better oiling high volume oil pump
double roller timing chain advanced 8 degrees
get a 4 bbl carb 750 cfm vac secondarys

i live in ga prolly be alot of shipping for the parts i have
i have a set of heads and a weind intake
if your intrested
my truck was wrecked and all i have left is the engine on a stand in the garage
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Old 02-26-2014, 07:33 PM   #3 (permalink)
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Make it a 400.
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Old 02-26-2014, 08:08 PM   #4 (permalink)
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Basics for any smog tuned engine would be a 4 barrel intake, a straight up timing chain set, maybe a better cam as long as you're in there, recurve the distributor to work with more initial timing and have total advance come in sooner.
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Old 02-27-2014, 06:47 AM   #5 (permalink)
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750cfm carb and matching intake, dual pattern RV cam with over .500" lift & straight up timing set, 750cfm carb (minimum, these motors need to breath, just be sure to tune it to get the best mileage, as its the vacuum signal on the carb that sucks in the fuel, not the cfm rating), & headers never hurt. Also freshen up the entire ignition system.

If you can swing it, go with a 400 rotating assembly & a set of flattops (google Tim Meyer for this). Do NOT go with a high volume pump without putting in a high capacity pan, you can suck the pan dry (I've wrecked one 400 doing this already), the best thing you can do (for your mild build) is get an auxiliary oil line kit from pricemotorsports.com which plumbs oil from a high pressure port under the mechanical fuel pump location to the top/back of the block where the oil pressure sending unit is to put more oil to the crank.

Let me know if you have any other questions, I've been around the block with these motors a few times.
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Old 02-27-2014, 09:28 AM   #6 (permalink)
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I did my 351M in my old bronco with a new timing set, edy intake and a 9905 edy 600cfm carb. The motor which had 100,000 miles on it woke up and ran great. The stock timing is retarded 8 degrees so a simple auto parts store timing set will reset it to 0 which works well and its super cheap. If you watch for used parts you could probably get it all done under $300.


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Old 02-27-2014, 06:50 PM   #7 (permalink)
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Looks like I left out an important part. This will be propane injection. So I am not sure the timing info will be as helpful since propane usually requires advanced timing. I went to propane on my last build and love it on the trail and rocks. Any tips on propane? Plan to run a standard impco 425 mixer with vacuum lock out on 4 barrel intake. I plan to modify the oil system and swap the pan if room allows. The rig will be low with minimal up travel so the larger pan may be an issue. Depends on how my stretch I get in the front with axle location.
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Old 02-27-2014, 06:57 PM   #8 (permalink)
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Definitely plan to upgrade the ignition. I hate the motorcraft ignition box/module. Always a mystery? I will pm you when I get close to tear down and clean up. I thought the 351 and 400 used the same rotating assembly with different heads?
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Old 02-27-2014, 07:20 PM   #9 (permalink)
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If you can find a good set of 351C 4V heads and replace the cam to a good aftermarket cam, 4V intake and headers 400 hp is very realistic. The link has some really good info.
High Performance Options for the 351M/400 Engine .: Articles
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Old 02-27-2014, 07:29 PM   #10 (permalink)
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I thought the 351 and 400 used the same rotating assembly with different heads?
351M/400 are pretty much the same except crank and pistons. The difference in displacement is from 1/2" difference in stroke.

The 351W is a different design, similar to the 260, 289, and 302, with a taller deck and bigger main bearings. The 351C is similar to the 351M/400. The latter have a taller deck, bigger main bearings, big block bellhousing pattern and unique engine mounts. The 351C uses the small block bellhousing and engine mounts.

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Old 02-27-2014, 07:45 PM   #11 (permalink)
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I will have to check but i believe i have a set of Hooker headers for a 351m that was in a 79F-250 4spd truck. I will post back tomorrow if i still have them. Sell them cheap!
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Old 02-27-2014, 07:54 PM   #12 (permalink)
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Sell it and buy a 385 series.
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Old 02-28-2014, 08:15 AM   #13 (permalink)
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If you can find a good set of 351C 4V heads and replace the cam to a good aftermarket cam, 4V intake and headers 400 hp is very realistic. The link has some really good info.
High Performance Options for the 351M/400 Engine .: Articles
Great article. That helped clear up alot of the questions I had about the different ford motors. I have had a few 351m motors over the years and was never blown away with them but was happy with the reliability they gave me.
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Old 02-28-2014, 08:17 AM   #14 (permalink)
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[QUOTE=woodchuck2;24372937]I will have to check but i believe i have a set of Hooker headers for a 351m that was in a 79F-250 4spd truck. I will post back tomorrow if i still have them. Sell them cheap![/QU

interested. let me know
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Old 03-01-2014, 07:24 AM   #15 (permalink)
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Looks like I left out an important part. This will be propane injection. So I am not sure the timing info will be as helpful since propane usually requires advanced timing. I went to propane on my last build and love it on the trail and rocks. Any tips on propane? Plan to run a standard impco 425 mixer with vacuum lock out on 4 barrel intake. I plan to modify the oil system and swap the pan if room allows. The rig will be low with minimal up travel so the larger pan may be an issue. Depends on how my stretch I get in the front with axle location.
The timing curve is completely different for propane from gasoline. You will need to have more base timing and less total timing. Around 30 degrees (base and centrifugal) @ 2500 rpm is where you want to be. Most the Fords we have dialed in ran around 16 to 18 degrees base timing. If you are going to run a vacuum advance make sure you limit it to 10 degrees additional timing and connect it to ported vacuum not manifold vacuum vacuum.

If you need any help give me a call or pm.
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Old 03-01-2014, 07:43 AM   #16 (permalink)
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Originally Posted by !!!blueoval!!! View Post
i have some parts you could use
i rebuilt my 351m i put a 4 bbl intake on it
did a bunch of head work
roller rockers crome moly push rods and rv cam
cross drilled the crank for better oiling high volume oil pump
double roller timing chain advanced 8 degrees
get a 4 bbl carb 750 cfm vac secondarys

i live in ga prolly be alot of shipping for the parts i have
i have a set of heads and a weind intake
if your intrested
my truck was wrecked and all i have left is the engine on a stand in the garage
What kind of money are you talking about? Package deal or are you selling individual parts? I get down to Florida a couple times a year.
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Old 03-03-2014, 02:03 PM   #17 (permalink)
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[QUOTE=bjordan;24381193]
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I will have to check but i believe i have a set of Hooker headers for a 351m that was in a 79F-250 4spd truck. I will post back tomorrow if i still have them. Sell them cheap![/QU

interested. let me know
What is the zip down there for shipping? Amazingly the Town you have listed has 6 zip codes!
I will give you an all in one price after i price shipping. What is your personal e-mail and i will send pics to that.
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Last edited by woodchuck2; 03-04-2014 at 03:09 PM.
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Old 03-03-2014, 02:30 PM   #18 (permalink)
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Buy a 400 crank and put it in there.

Dual plane intake and 600-650cfm carb

Long tube headers

The heads flow pretty decent so they can stay, but porting and polishing cant hurt.
You can also have the heads decked to bump up compression. They respond well to a 9:1 ratio if I remember right.

Cam/lifters/springs/timing chain all need to match. Comp makes cams for standard and high compression engines.
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Old 03-13-2014, 02:11 PM   #19 (permalink)
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You still interested in these headers?
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Old 03-16-2014, 07:53 PM   #20 (permalink)
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[QUOTE=woodchuck2;24441993]
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What is the zip down there for shipping? Amazingly the Town you have listed has 6 zip codes!
I will give you an all in one price after i price shipping. What is your personal e-mail and i will send pics to that.
PM sent
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