confused about engine
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Mountain Pass
Joined: May 2010
Posts: 118
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confused about engine
Have had several older Ford trucks - now have just bought a 1978 F150. I am 3rd owner, 1st one put new engine in and 2nd 0wnwer said it had about 80k on. Trying to ID looks like a 351W with thermostat in front left side of intake manifold ( simple ) now the twist - valve covers have 8 bolts and look like a 351M. Q- when rebuilt can a 351W motor have a 351C or Mod heads to explain the 8 bolt covers
Post Fiend
Joined: Oct 2003
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From: utica il
i am no expert by any means, but i believe a 351c is a windsor with high flow "m like" heads. i'm sure there are some tech articles on this. i see this is your first post, try the search function here, and welcome to fte. otherwise, by tommorow i'm sure some one who knows for sure will answer you.
Posting Guru
Joined: Apr 2010
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From: Southaven,Ms
cleveland or mod heads will fit on a windsor block but it requires machine work on the water passages and a special manifold. in Ford circles this would be called a clevor. Ford did this in 69/70 as the boss302. a cleveland is in the same family as a 351m or 400. it is not windsor based. hope all this helps. you eather have a "clevor" as previously described or a boss which would be a big score
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Mountain Pass
Joined: May 2010
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I am thinking the block is a winsor since the thermostat housing is in the intake manifold and other parts match up in location and angle - coil, oil filter and fuel pump. and the heads are 8 bolt. so how would I tell differance from a boss to a clevor
Posting Guru
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From: Southaven,Ms
boss was 302 based with 4 bolt mains. clevor can be either,but most people base them on 351w. intake on a clevor would be aftermarket and most likly aluminum. boss intake would be a factory piece. most likely someone built a clevor as the boss is extremely rare and wouldnt likly be used in a truck
Post Fiend
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From: utica il
i know clevelands are 335-series, but they have a small block bell pattern. 351-400m's are big block pattern. i haven't been into the older trucks in awhile, but isn't there a # on the top of the tranny bell that tells you some info?
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Senior User
Joined: Mar 2006
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From: Morganton, NC
What intake do you have, and can you find a part number on it? that will most likely tell you what you have.
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Ford Parts Specialist
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From: Simi Valley, CA
351C/351M/400: 8 valve cover bolts per side.
302/351W: 6 valve cover bolt holes per side.
351C: 1970/74 Passenger Cars & Ranchero's only.
351W's were not installed in F150/350's until 1981.
Largest V8 engine available in 1980/83 F100's: 302.
btw: There are no Ford part numbers marked on any parts after 1956. ID engineering numbers only (when applicable).
302/351W: 6 valve cover bolt holes per side.
351C: 1970/74 Passenger Cars & Ranchero's only.
351W's were not installed in F150/350's until 1981.
Largest V8 engine available in 1980/83 F100's: 302.
btw: There are no Ford part numbers marked on any parts after 1956. ID engineering numbers only (when applicable).
Thread Starter
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Mountain Pass
Joined: May 2010
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the intake is cast so it must be a boss. The engine is a rebuild from the original owner(a mechanic) had oil, trany flushed with new filter and the 9 inch pumkin drained and refiled, the spun the drive and figured puimkin was close to a 353 ratio or there about. Front end tight, some play from pinion arm - base of power gear box, all new brakes, strait clean body, some rust in pass. floor needs new heat core, original paint copper with the butter cream will get pics for you guys to see! pd 900
Laughing Gas
Joined: Dec 2007
Posts: 1,052
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From: Alvarado, TX
I'm having a hard time believing that anyone would put an incredibly rare and expensive Boss 302 into an pickup. There were only a few thousand of them built for racing and homogilation in 69 and 70. Not only that but they are high winding top end engines, not really appropriate for a truck. The fact that the manifold is cast doesn't mean anything because 99% of them are whether they're aluminum or iron.
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