Flywheel question for C6
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5th Wheeling
Joined: Sep 2021
Posts: 40
Likes: 3
Flywheel question for C6
Hey, i picked up a 1984 C6 transmission to use with my 351C. Do i need to go with a new flywheel or are the 351c and 351w flywheels interchangeable.
Also, i was told my Cleveland was out of a 1970 cougar, D2AE CA 1K18, (last 4 numbers were tough to read) This looks like a 72, can anyone confirm?
Thanks in advance.
Also, i was told my Cleveland was out of a 1970 cougar, D2AE CA 1K18, (last 4 numbers were tough to read) This looks like a 72, can anyone confirm?
Thanks in advance.
Cargo Master
Joined: Oct 2011
Posts: 2,240
Likes: 299
From: Kenner,La.
Flywheel
Make sure your 351c flywheel matches the bolt pattern of the C6 converter. If it matches then stay with the 351c flywheel. I do not think the converter bolt pattern was ever changed, just be sure if there is a forward facing drain plug that it will line up with a hole in the flywheel.
Hotshot
Joined: Oct 2009
Posts: 16,160
Likes: 4,763
From: Burbank, WA
1K18 would be October 18, 1971, which by then 1972 model year production would've been in full swing. There's nothing else in the casting number that would tell you what the block came from. You could look for the partial vin stamped in it, which would tell you what assembly plant it was from, and if it was a Ford or a Mercury. Knowing the assembly plant will tell you what models were built there in 72 to narrow it down some. If you really have to know more than that, Kevin Marti may be able to run a report on the partial vin, but that will cost money.
It would depend on what the C6 was behind to know if the flywheels will interchange. The 302 had a different balance requirement in '84 than the 351 so that could be an issue. Size and tooth count are also critical to make sure the starter engages. Also make sure your new C6 fits the small block and not the big block. I think trucks were the only thing that used the C6 by '84.
It would depend on what the C6 was behind to know if the flywheels will interchange. The 302 had a different balance requirement in '84 than the 351 so that could be an issue. Size and tooth count are also critical to make sure the starter engages. Also make sure your new C6 fits the small block and not the big block. I think trucks were the only thing that used the C6 by '84.
Thread Starter
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5th Wheeling
Joined: Sep 2021
Posts: 40
Likes: 3
1K18 would be October 18, 1971, which by then 1972 model year production would've been in full swing. There's nothing else in the casting number that would tell you what the block came from. You could look for the partial vin stamped in it, which would tell you what assembly plant it was from, and if it was a Ford or a Mercury. Knowing the assembly plant will tell you what models were built there in 72 to narrow it down some. If you really have to know more than that, Kevin Marti may be able to run a report on the partial vin, but that will cost money.
It would depend on what the C6 was behind to know if the flywheels will interchange. The 302 had a different balance requirement in '84 than the 351 so that could be an issue. Size and tooth count are also critical to make sure the starter engages. Also make sure your new C6 fits the small block and not the big block. I think trucks were the only thing that used the C6 by '84.
It would depend on what the C6 was behind to know if the flywheels will interchange. The 302 had a different balance requirement in '84 than the 351 so that could be an issue. Size and tooth count are also critical to make sure the starter engages. Also make sure your new C6 fits the small block and not the big block. I think trucks were the only thing that used the C6 by '84.
Chris
Hotshot
Joined: Oct 2009
Posts: 16,160
Likes: 4,763
From: Burbank, WA
Make sure your 351c flywheel matches the bolt pattern of the C6 converter. If it matches then stay with the 351c flywheel. I do not think the converter bolt pattern was ever changed, just be sure if there is a forward facing drain plug that it will line up with a hole in the flywheel.
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Logistics Pro
Joined: Oct 2006
Posts: 4,029
Likes: 890
From: East Central Ia
Yes it was a six or eight bolt convertor and flywheel, very hard to find bought new flywheel once convertor needs to be sent in for rebuild if needed, no cores. Don't fall off trees and never did. Last small block in US for cars was 1979 LTD with 351 and towing option. Then in trucks till later.
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Cargo Master
Joined: Oct 2011
Posts: 2,240
Likes: 299
From: Kenner,La.
Converter
A Cobra converter also has about a 1/8” larger nose. I ran into this years ago with a 429 CJ which would not receive the stock C6 converter nose. I ended up having a machine shop turn down the nose.
Logistics Pro
Joined: Jul 2016
Posts: 3,646
Likes: 816
From: Swan River Valley M.B Can
The aod flywheel is also a different depth but the same otherwise . If used the converter on the c6 will not be fully seated if the c6 flywheel is used on an AOD it will push on the front pump and in minutes destroy a freshly rebuilt AOD . Ask me how I know this . lol
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