Ford 351
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Ford 351
what on earth is the difference between these 3 motors>
351Modified
351Clevland
351Windsor
if i am correct they all have the same CID, so why did ford have to use 3 differnt models of the same engine, availabe at the same time?
351Modified
351Clevland
351Windsor
if i am correct they all have the same CID, so why did ford have to use 3 differnt models of the same engine, availabe at the same time?
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
In brief.
The Cleveland is an engine that was designed for performance in the late sixties and started production in 1970.
It has canted valves, an integral timing case and the water outlet is in the block.
The Windsor (small block) was introduced in the early 60's and later production was assembled in Windsor, Ontario.
It has inline valves, a separate timing case, the water outlet is in the intake manifold, and an oiling system that addresses some of the Cleveland's shortcomings.
The 351 M/400 is basically a Cleveland (335 series) that has Windsor style crank journals and the bellhousing pattern of a big block (Lima) engine so it can bolt up to a heavy duty driveline.
The Cleveland is an engine that was designed for performance in the late sixties and started production in 1970.
It has canted valves, an integral timing case and the water outlet is in the block.
The Windsor (small block) was introduced in the early 60's and later production was assembled in Windsor, Ontario.
It has inline valves, a separate timing case, the water outlet is in the intake manifold, and an oiling system that addresses some of the Cleveland's shortcomings.
The 351 M/400 is basically a Cleveland (335 series) that has Windsor style crank journals and the bellhousing pattern of a big block (Lima) engine so it can bolt up to a heavy duty driveline.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Originally there were only two engines in this size; the 351C and the 351W. As stated above, the 351C was introduced as a performance engine.
My understanding is that when the 351C was retired; the 351W alone could not be manufactured in large enough volume to fill the void; so the 351M was introduced to meet the demand. Since the 351M is simply a destroked 400, it took little engineering effort to make this happen.
At any given time, only two 351 engines were available. First the 351C and the 351W, and then the 351M and the 351W. There was never any point in time when all three were available at the same time. Also note that you couldn't always order either one. I have seen some 70-74 full-size sedans that had a 351W, and some of the same year that had a 351C. I'm not sure if you could pick which family it came from, or if it was based on where the car originated - or if the ones I've seen were original or not. However, the 351M was the only 351 available in pickups 75 (I think?) to 79; you could not order a 351W in a pickup until later - even though the 351W was used in sedans during those same years.
My understanding is that when the 351C was retired; the 351W alone could not be manufactured in large enough volume to fill the void; so the 351M was introduced to meet the demand. Since the 351M is simply a destroked 400, it took little engineering effort to make this happen.
At any given time, only two 351 engines were available. First the 351C and the 351W, and then the 351M and the 351W. There was never any point in time when all three were available at the same time. Also note that you couldn't always order either one. I have seen some 70-74 full-size sedans that had a 351W, and some of the same year that had a 351C. I'm not sure if you could pick which family it came from, or if it was based on where the car originated - or if the ones I've seen were original or not. However, the 351M was the only 351 available in pickups 75 (I think?) to 79; you could not order a 351W in a pickup until later - even though the 351W was used in sedans during those same years.
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