351w or 351M
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Freshman User
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351w or 351M
So I have some one wanting to trade my 351w for there 351M that has less than 1000 miles, my only question is that, which ones better are motor mounts the same? Can my t18 transmission bolt up to it? If not is there an adapter? And would be it cheaper to get parts for a 351w or 351M..just want to get all my ducks in a row before seal the deal
Lead Driver
Joined: Jul 2011
Posts: 8,679
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From: On the Edge of the Desert
Don't do it.
W will out perform M in every way. The only way to make a good 351M is to turn it into a 400 with good compression Pistons. Otherwise, the 351M is a real dog.
It won't bolt up to your motor mounts or your bellhousing. It uses the 429/460 bell pattern.
W will out perform M in every way. The only way to make a good 351M is to turn it into a 400 with good compression Pistons. Otherwise, the 351M is a real dog.
It won't bolt up to your motor mounts or your bellhousing. It uses the 429/460 bell pattern.
Thread Starter
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Freshman User
Joined: Sep 2014
Posts: 38
Likes: 0
Don't do it.
W will out perform M in every way. The only way to make a good 351M is to turn it into a 400 with good compression Pistons. Otherwise, the 351M is a real dog.
It won't bolt up to your motor mounts or your bellhousing. It uses the 429/460 bell pattern.
W will out perform M in every way. The only way to make a good 351M is to turn it into a 400 with good compression Pistons. Otherwise, the 351M is a real dog.
It won't bolt up to your motor mounts or your bellhousing. It uses the 429/460 bell pattern.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
351m/400 are the engines Ford hit the hardest with emissions equipment. It was their most selling engine family and they had to so as to meet Federal Emission average standards. We can thank the Feds for the underpowered 351M/400.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
These heads usually cracked after the 2 year/24,000 mile warranty had expired, p!ssing off 1000's of owners.
700 bucks (a lotta money back then) to replace the heads including parts/labor and a core charge. We used GPD heads since they came with the valves, some were new, some remanufactured.
Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
You also have to ask yourself why someone with a thousand mile 351M would want to trade you for your 351W?
If they were satisfied with the 351M, with only 1,000 miles on it, they wouldn't want to be trading it for your 351W.
Sounds like they are trying to unload their headache on you.
If they were satisfied with the 351M, with only 1,000 miles on it, they wouldn't want to be trading it for your 351W.
Sounds like they are trying to unload their headache on you.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
The thing is, the 351W has been swapped into the OP's truck, since it wasn't available in F150/350's and Bronco's until 1981.
OP's "About Me" profile sez 1967 F150. 'Course the F150 wasn't introduced until 1975. The only V8 available in 1967 F100/350's was the 352 2V
OP's "About Me" profile sez 1967 F150. 'Course the F150 wasn't introduced until 1975. The only V8 available in 1967 F100/350's was the 352 2V
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Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
Do you recall the head cracking problem that affected 1975/78 351M/400?
These heads usually cracked after the 2 year/24,000 mile warranty had expired, p!ssing off 1000's of owners.
700 bucks (a lotta money back then) to replace the heads including parts/labor and a core charge. We used GPD heads since they came with the valves, some were new, some remanufactured.
These heads usually cracked after the 2 year/24,000 mile warranty had expired, p!ssing off 1000's of owners.
700 bucks (a lotta money back then) to replace the heads including parts/labor and a core charge. We used GPD heads since they came with the valves, some were new, some remanufactured.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Here in LA LA Land, GPD (Genuine Parts Distributors) was once owned by Tomadur Engine. They were located near the smelly Farmer John meat packing plant in Vernon.
Dunno who owns it to today, but they're located about 5 miles NE of my residencia in the City of Industry....where the air doesn't smell like a slaughterhouse.
Dunno who owns it to today, but they're located about 5 miles NE of my residencia in the City of Industry....where the air doesn't smell like a slaughterhouse.
Cargo Master
Joined: Dec 2006
Posts: 2,511
Likes: 8
From: hinckley ohio
Reading up on 351m-400 builds people found that the cams were retarded like 4 degrees.This making them dogs. I had a 400 that would smoke 35 inch Bf G.all terrain tires. Trick is to use a degree wheel to set cam.
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
The cam is just one part of it. Compression was low, exhaust was restrictive, ignition timing was low, carb was small. You can make a 400hp 400 with the right pieces. Just like any other motor. But the 351M is pretty much doomed in the performance realm.
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