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PostPosted: Wed Nov 27, 2019 9:22 pm 
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Hi to everyone, I just finished redoing a 1989 Ford F150. Now on to my next project. I am rebuilding a 1974 Cougar with a 351 Cleveland 4 barrel carb. I want to swap out out the engine (seized) with a donor engine from a 1976 Cougar which has a 351m/400 motor with 2 barrel carb. Both cars have the same C6 tranny but I am wondering if the engines will interchange or should I pull both the motor and tranny as a unit for the swap. Also wondering if the 4 barrel carb and manifold (351C/1974) will fit the 351m/400 1976 motor. The newer motor has been previously rebuilt and runs well, just the car was written off due to an accident. Maybe I should not consider swapping carbs. Thanks to all who respond.


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PostPosted: Thu Nov 28, 2019 6:04 am 
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Thanks for joining!

The 351M/400 line of engines is different from the 351C. The bellhousing bolt pattern is the same as a BBF, not a SBF. Also the 351M/400 block is much taller, so the engines are physically bigger. A taller deck height means that the intakes won’t interchange between the M and the C.

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Brent Lykins, Lykins Motorsports
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brent@lykinsmotorsports.com


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PostPosted: Thu Nov 28, 2019 8:50 am 
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Thank you


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PostPosted: Thu Nov 28, 2019 4:59 pm 
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It will be a great swap, given that the top end can't be switched and you use the same tranny as Brent noted.


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PostPosted: Thu Nov 28, 2019 8:35 pm 
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Now I am second guessing if they both have the same tranny anyway. On the 1974, the pillar code is a "U" and according to my 1974 shop manual it is a C6. On the 1976, the pillar code is a "W". I don't have a shop manual for a 1976 model year but using the 74 manual this would mean it has a C4 tranny. Seems a bit backwards? I thought the C6 came after the C4 in development. Everyone's advice is appreciated.


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PostPosted: Thu Nov 28, 2019 11:52 pm 
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The C6 was introduced in 1966 and is a large, heavy and very strong transmission. It was made with the small block, FE and 385 series bell housings and that bell housing is made onto the aluminum trans case it is all one piece. The C4 is a smaller lighter transmission that was introduced in 1964. It was made with small block and the 385 series style of bell housings for use behind many small Ford engines and very very few 351M engines. The C4 has a bell housing that bolts onto the transmission case and that case is aluminum.

From what I've seen most Cleveland, 351M and 400 engines come with the FMX transmission. This is an older transmission that's based on the Borg Warner design from the early 1950's. The transmission was made with the small block, FE and 385 style bell housings for use behind the 351M and 400. Its bell housing also bolts on but the case of the transmission is made from cast iron.

I hope this helps.


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PostPosted: Fri Nov 29, 2019 11:01 am 
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Thanks, the more I learn the better.


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