C & M block differences
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Joined: Aug 2000
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From: (near) Denver USA
C & M block differences
Motor mounts are different. M-blocks (351M/400) have a unique mount. 351C mounts are the same as those for 302 and 351W V8s and the 300 I6.
The exhaust manifolds will interchange between M-blocks and 351C 2V heads. 351C 4V heads have a unique exhaust manifold.
The exhaust manifolds will interchange between M-blocks and 351C 2V heads. 351C 4V heads have a unique exhaust manifold.
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Junior User
Joined: Dec 2002
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From: Western IL
C & M block differences
So the mounts off a 302 will fit? I'm gonna try to put a 351 C in a 78 150 4wd that now has a 300-6. I know the trans will fit, but where do I find a flywheel?
Posting Guru
Joined: Aug 2000
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From: (near) Denver USA
C & M block differences
Oops! Sorry about that 300 I6 reference. (I was thinking of bell housings and typing about motor mounts.)
302, 351W, and 351C use the same engine mount attachment to the block, but the actual engine mounts varied by vehicle application and year. Apparently, the position of the engine mount brackets on the frame varied.
I've heard you can use the 302 engine mounts to swap a 351C in the late '70s trucks. The current service part number for the '78 truck 302 engine mount is E4TZ-6038-H.
302, 351W, and 351C use the same engine mount attachment to the block, but the actual engine mounts varied by vehicle application and year. Apparently, the position of the engine mount brackets on the frame varied.
I've heard you can use the 302 engine mounts to swap a 351C in the late '70s trucks. The current service part number for the '78 truck 302 engine mount is E4TZ-6038-H.
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Freshman User
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C & M block differences
So how bad is it that the person (previous owner) that put my 351M in used the 351C mounts?
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Senior User
Joined: Jan 2003
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C & M block differences
I don't see how a person could interchange the mounts between the 351M and the Cleveland. They bolt to the block in entirely different places, with different bosses at different angles. Unless someone welded up some kind of dicombobulated brackets.....
Posting Guru
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From: Paola, KS
C & M block differences
Originally posted by 79f250&70Mustang
So how bad is it that the person (previous owner) that put my 351M in used the 351C mounts?
So how bad is it that the person (previous owner) that put my 351M in used the 351C mounts?
Elder User
Joined: May 2002
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From: Sin City, USA
C & M block differences
Actually, Ford did install the 302C and 351C in F-Series trucks in Australia and New Zealand. The F-100 was built here final assembled there in RHD and used Aussie sourced Clevo's until 1982. I have a 351C in my Falcon that came from a F-100.
But in the US, you are correct, Ford US never installed a 351C in a F-Series.
--J
But in the US, you are correct, Ford US never installed a 351C in a F-Series.
--J
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C & M block differences
Guess I need to fess up and tell you that it is not in my truck but in my 70 mustang that the 351M lives. (I hope that you will not hold it against me)
I am not sure how he did it but when I looked, over the weekend, the mounts are the C type with 2 screws in the pasengers side mount and 1 in the drivers side mount. At this point I am assuming that he drilled/tapped bolt holes into the block to avoid finding the correct mounts.
On a positive note he did find the correct bell housing for the FMX transmission.
I am not sure how he did it but when I looked, over the weekend, the mounts are the C type with 2 screws in the pasengers side mount and 1 in the drivers side mount. At this point I am assuming that he drilled/tapped bolt holes into the block to avoid finding the correct mounts.
On a positive note he did find the correct bell housing for the FMX transmission.
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Junior User
Joined: Dec 2002
Posts: 90
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From: Western IL
C & M block differences
I know some of the parts for an M and a C will swap, but i'm not sure which ones... I read somewhere that the M crank is about 15 pounds heavier than the Cleveland. I take it then that the flywheel off an M won't work on a C? Does anyone know what cars/ years that the Cleveland was put in with and auto, so i know what to look for.
Thanks,
78ford100
Thanks,
78ford100