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Old May 23rd, 2007, 10:13 AM   #1
caveman
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Default 78 ford 400. BB or SB?

a 400 from a 78 f150 would be a big block or small black?

or the question is, can i remove the engine (400) and put a 460 or 429 on the same trans...
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Old May 23rd, 2007, 10:17 AM   #2
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a 400 from a 78 f150 would be a big block or small black?

or the question is, can i remove the engine (400) and put a 460 or 429 on the same trans...
Yes you can swap it out but you need to change the motor mounts that is all you need to do. Jeffs bronco graveyard has them for 130. The trans should be a C-6 and the t-case should be 203 or 205. I done this swap out all ready.
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Old May 23rd, 2007, 10:21 AM   #3
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Yes you can, but everyone has they're own opion if the 351/400m is techincally a SB or BB
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Old May 23rd, 2007, 11:12 AM   #4
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The 400/351M is a big block, it is a 351bigblock with 400 heads on it. It was used in Full size pickups and broncos in the late 70's to early 80's. It was discountinued and replaced the the 5.8L 351 small block because the 351M was found to be unreliable and constantly having problems.
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Old May 23rd, 2007, 11:28 AM   #5
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i disagree, those motors ran forever.

you'll have to change the exhuast also which isnt easy cause car manifolds run into the passenger side frame. The torque converter snout is a different size going from a 400 to a 460.
It's really a small block with a big block bellhousing bolt pattern. They take the same size pistons as a 351 cleveland except the wrist pin is a different size.
351m and 400 heads are identical, the only difference between the 2 is the crank and pistons.

Last edited by TurdBronco; May 23rd, 2007 at 11:33 AM.
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Old May 23rd, 2007, 11:33 AM   #6
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i disagree, those motors ran forever.

you'll have to change the exhuast also which isnt easy cause car manifolds run into the passenger side frame. The torque converter snout is a different size going from a 400 to a 460.
It's really a small block with a big block bellhousing bolt pattern. They take the same size pistons as a 351 cleveland except the wrist pin is a different size.
I disaggree, I have done this swap, all I needed was the engine mounts from jeff's bronco graveyard, then it bolted right in. Didn't have to change anything else at all.

If the 351M was such a good motor then why is everyone junking them and going to a 351C, 351W, or 460bb.
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Old May 23rd, 2007, 11:36 AM   #7
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Like Ken said It is a small block with a big block 429/460 bolt pattern. The cam and I believe the heads and other parts were same as 351 Cleveland. Both 351M and 400 used same heads only difference was longer stroke. Car Craft did a budget build on a 400 and got 390HP and 450 ft lbs torque on a 2 barrel carb
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Old May 23rd, 2007, 11:39 AM   #8
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I got one sitting on my shop floor and I can not give it away. Guess it will go to the scrap yard on my next trip.
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Old May 23rd, 2007, 11:52 AM   #9
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^ see :tonka:
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Old May 23rd, 2007, 12:42 PM   #10
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If the 351M was such a good motor then why is everyone junking them and going to a 351C, 351W, or 460bb.
not junkin mine. still runs like a champ.
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Old May 23rd, 2007, 01:24 PM   #11
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Mine ran great for over 15 years and that was after years of abuse as a car hauler/wheeler in west branch. I left the hood off of it for a year in my back yard and water got in it and rusted it up. That is the only reason that I going to go with a 460. 400 with hooker headers/edelbrock intake and a Holley 650 worked great had tons of power.

i have many spare parts including the couple hundred mile hooker super comps if anyone is still running a 351M..

And yes from what I have read they are a small block (351C) stroked with a big block bell housing.

Here is a good read on the history of them

http://home.earthlink.net/~bubbaf250...history03.html
http://www.broncotech.com/351M.html
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Old May 23rd, 2007, 03:02 PM   #12
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man, thought i was confused about it before... :) thanks guys
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Old May 23rd, 2007, 05:37 PM   #13
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Quote:
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If the 351M was such a good motor then why is everyone junking them and going to a 351C, 351W, or 460bb.
because they dont know what they are doing. 400's are great motors. And whose everyone? Maybe YOU are trying to junk it but that doesnt mean a motor is worthless because you dont like it. It's a common swap because there are alot more 460's around than 400's. I've yet to talk to anyone that has even a mildly built 400 and doesnt like it.

If you happen to find a 460 that came in a 78-79 f150, you would have the correct manifolds to use, if not its a crap shoot.

I have done the swap also, had bronco's with a 460 and 400.
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Old May 23rd, 2007, 08:15 PM   #14
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i love my 400 so far and i'm gettin one to build up soon.
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Old May 23rd, 2007, 09:27 PM   #15
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good deal

get some flat top pistons (brand name badger). They are hard to find as i don think they are produced anymore. Mill the heads .010 or so, get a different cam and you should be good to go.
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Old May 24th, 2007, 12:30 AM   #16
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good or bad, they arent a small block or a big block, but their own design, they are the "M" series blocks, they do have the same bellhousing pattern as the regular big blocks.
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Old June 29th, 2007, 11:57 AM   #17
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good deal

get some flat top pistons (brand name badger). They are hard to find as i don think they are produced anymore. Mill the heads .010 or so, get a different cam and you should be good to go.
Better yet, put a set of the elusive Australian closed chamber 2V ( 2 barrel for you non ford guys) heads on it with the stock pistons, and a torque cam.

I always wanted to see this done - those open chamber heads leave a lot to be desired quench wise.
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Old June 29th, 2007, 02:17 PM   #18
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I just bought a truck that the VIN says the motor is a 351M(it looks bigger though)...

So I can just basically pull this motor and slap in a 460? I already have the 460 so why not right?
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Old June 29th, 2007, 02:30 PM   #19
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I just bought a truck that the VIN says the motor is a 351M(it looks bigger though)...

So I can just basically pull this motor and slap in a 460? I already have the 460 so why not right?
YEP, I did this swap in the 79 Cougar, The 460 even bolted right up to the exhaust. Same motor mounts and all.

Let me know if you need some 460 parts, I have a complete engine I need to get rid of.
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Old June 29th, 2007, 02:30 PM   #20
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Quote:
Originally Posted by biohazardbill View Post
I just bought a truck that the VIN says the motor is a 351M(it looks bigger though)...

So I can just basically pull this motor and slap in a 460? I already have the 460 so why not right?
Is the 351M toast?

Mine ran sweet with Hooker super comps, Holley 650, and a edelbrock intake and not much else.

But yeah besides the TC snout comment sounds like just the motor mounts. I will be swapping out the 302 in my 76 shortly for a 460. Just drove it around the block last night first time in 6 years
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