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AMC Harmonic Vibration Damper Listing
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SC397 View Drop Down
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    Posted: Apr/20/2012 at 12:13pm

For reference, each damper was individually balanced to each crank. The drilled holes were part of the balancing process.

Vibration Damper Listing

'67-'69 290: #3180477
'70-'71 304: #3196924
'72+ 304: #3216083
'67-'69 343: #3181612
'70-'71 360: #3196925
'72+ 360: #3230131
'68-'69 390: #31916189
'70 390: #3196925 (same part number as a '70 360 but balanced differently at engine assembly)
'71 401: #3211454 3-bolt(this is according to old info. I have one with no numbers at all on it)
'7? 401: #3211454 4-bolt
'73/4 401: #3216085 4-bolt

 

290 Vibration Dampers.  The one on the left is 1966 only.  The one on the right is 1967-69

290 Damper on the left, '67-'69 343 on the right (Note no cut out in the weight pad)

'68-'69 390 Vibration damper on the left, 1970 390 Vibration Damper on the right.  The off-set weight goes 180 degrees on the 1968-1969 390. The off-set weight goes 240 degrees on a 1970 390  ( all are 3-bolt)

1973 and latter 4 bolt Dampers.  304, 360, 401.  The off-set weight goes 90 degrees around on a 304 (both 3&4 bolt)   The off-set weight goes 240 degrees around on a 360 (both 3 & 4 bolt)   The off-set weight goes 180 degrees on a 1971-1972 401. (3-bolt)    The Off-set weight goes 240 degrees on a 1973 and latter 401 (4-bolt)

Edited by SC397 - Apr/23/2012 at 7:29pm
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Points: 5521 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SEdmonds Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2012 at 12:19pm
Great info - thanks for posting.
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Points: 835 		Post Options Post Options   Thanks (0) Thanks(0)   Quote bigbadgreen Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2012 at 12:39pm
So 70 390 balancer won't work for 70 360? I thought they were same.
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SC397 View Drop Down
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Points: 1454 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2012 at 12:40pm
(same part number as a '70 360 but balanced differently)
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Points: 229 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Have2SC's Quote  Post ReplyReply Direct Link To This Post Posted: Apr/20/2012 at 3:10pm
  rick, useful info as always!! i believe you were the one that posted all that info on the forum months ago which is were i got my list of vibe damper part numbers from! 
1971 SC360 Hornet 1969 BBG AMX 1969 SC/Rambler                               
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Points: 1432 		Post Options Post Options   Thanks (0) Thanks(0)   Quote carnuck Quote  Post ReplyReply Direct Link To This Post Posted: Apr/22/2012 at 1:01am
I need to make a 4 bolt balancer that will work with my 290 for the accessories from my '82 Honcho.
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Points: 10042 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/22/2012 at 1:08am
Originally posted by SC397 SC397 wrote:



'70 390: #3196925 (same part number as a '70 360 but balanced differently)



This makes no sense to me. If I went to the dealer in 1978 and asked for part# 3196925 how would they know if I wanted the 360 version or the 390 version? So real question is are we talking about a casting number or part #
Dan Curtis, AZ AMC collector quality Restorations, Parts & Engines - amcmusclecars.com
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Originally posted by carnuck carnuck wrote:

I need to make a 4 bolt balancer that will work with my 290 for the accessories from my '82 Honcho.



There is no such thing. All you can do is take any 4 bolt balancer and match balance it to an original 290 balancer.
Dan Curtis, AZ AMC collector quality Restorations, Parts & Engines - amcmusclecars.com
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That's what I said
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Points: 10042 		Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/22/2012 at 1:24am
what did you say? You said you want a 4 bolt balancer to go with a 290. It does not exist so you can take ANY 4 bolt blancer and have it match balanced but there no such thing as one to bolt on without first modifying it to match the 290.

The closest will probably be the 304.
Dan Curtis, AZ AMC collector quality Restorations, Parts & Engines - amcmusclecars.com
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