Help, wrong engine!
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Help, wrong engine!
Hey all, I am working on a 1974 f-100 that does not have the original engine in it. I was told that it was now a 351m when I started the project. The motor was tired and had one pretty dead piston. We decided to build a 400 to replace it. Just pulled out the 351 and it turns out its a cleveland not an m! Now I am in big trouble. What will it take to do this swap? I have the C-6 that came with the 400, so I assume I will be swapping that in as well. I will obviously need a shorter driveshaft, will I need a different tranny cross member? Are the frame mounts the same for the engine or will I need to modify those too? The 400 core came from a car and the car mounts are obviously different. If I get the truck mounts will the motor bolt to the frame? Any advice is appreciated. I am tearing my hair out from listening to the mechanic who told me it was a 351m and not making sure before spending plenty of money on this 400. Thanks, Jeremya72
Hotshot
Joined: Jan 2011
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From: THIS IS SPARTA!, ...Mo.
Yeah, I like the Cleveland MUCH more than the 400. The Cleveland has a small block bell housing. You'll need the big block C6. I'm not sure if anything other than the bell housing is different. (transmission-wise) Cars engine mounts are different. Car oil pans are mostly front sump, too. If the truck is 4wd, the front sump pan will work. Otherwise, you'll have to find a truck pan and oil pick up too.
Having a 351 Cleveland is NOT a bad thing. Build the Cleveland and have the baddest F250 on the block.
Having a 351 Cleveland is NOT a bad thing. Build the Cleveland and have the baddest F250 on the block.
Elder User
Joined: Aug 2011
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From: Cape Coral, Florida
You have all the parts you need to swap in the 400 that you already started to build ? Save the 351c for another project or sell it . Wake up the 400 and it will provide plenty of power for daily drive as well as a weekend warrior
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Joined: Oct 2010
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From: Northern and Southern Cal
Not saying that I know what you have but the engines are from the same family.
Here is a good article on the subject.
351C, 351M, or 400 Ford Engine - What is the difference? - FordMuscle
Edit
Sorry. Forgot you have to be a member to see the next pages.
If you want it, pm me and I'll send.
Here is a good article on the subject.
351C, 351M, or 400 Ford Engine - What is the difference? - FordMuscle
Edit
Sorry. Forgot you have to be a member to see the next pages.
If you want it, pm me and I'll send.
Postmaster
Joined: Oct 2010
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From: Northern and Southern Cal
Since you have a '74 I'll include this section if for no other reason than interest.
It's from the following pages that are not viewable unless you're a member.
Remember that the 351M and 400 were designed to bolt up to Fords existing big-block (385 series) transmissions. However in '73 Ford produced a small number of 400 engines with a small-block (Windsor) bellhousing pattern, such as the one shown right. Rumor is this was done for the Panteras in case 351C supply fell short. Casting number is D3AE-B, if you think you've got one.
It's from the following pages that are not viewable unless you're a member.
Remember that the 351M and 400 were designed to bolt up to Fords existing big-block (385 series) transmissions. However in '73 Ford produced a small number of 400 engines with a small-block (Windsor) bellhousing pattern, such as the one shown right. Rumor is this was done for the Panteras in case 351C supply fell short. Casting number is D3AE-B, if you think you've got one.
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That's interesting, never heard that before. Unfortunately, the one I have is the normal big block bellhusing. Oh well, I was eventually planning to swap the C6 in anyway for towing my big trailer
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Postmaster
Joined: Oct 2010
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From: Northern and Southern Cal
I went back and reread to make sure I get it.
Let me see if I'm with you.
You have a 351C that you were told was a 351M.
Because it's not a 351M you bought a 400M.
So now you have a 400M and a 351C.
Let me see if I'm with you.
You have a 351C that you were told was a 351M.
Because it's not a 351M you bought a 400M.
So now you have a 400M and a 351C.
Postmaster
Joined: Oct 2010
Posts: 4,656
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From: Northern and Southern Cal
Looks like these may work for you.
You can order them either way.
Ford 351C, 351M, 400M Rubber Motor Mounts - Speedway Motors, America's Oldest Speed Shop
You can order them either way.
Ford 351C, 351M, 400M Rubber Motor Mounts - Speedway Motors, America's Oldest Speed Shop
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Joined: Nov 2007
Posts: 340
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From: Near Madison, WI
Yeah, I like the Cleveland MUCH more than the 400. The Cleveland has a small block bell housing. You'll need the big block C6. I'm not sure if anything other than the bell housing is different. (transmission-wise) Cars engine mounts are different. Car oil pans are mostly front sump, too. If the truck is 4wd, the front sump pan will work. Otherwise, you'll have to find a truck pan and oil pick up too.
Having a 351 Cleveland is NOT a bad thing. Build the Cleveland and have the baddest F250 on the block.
Having a 351 Cleveland is NOT a bad thing. Build the Cleveland and have the baddest F250 on the block.
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