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AMC Harmonic Vibration Damper Listing

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7172AMX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 7172AMX Quote  Post ReplyReply Direct Link To This Post Posted: Jul/27/2015 at 6:42pm
Originally posted by Hurst390 Hurst390 wrote:

I have a 73 401 with a 3 bolt damper and 090 heads..I believe early 73 production
Seems 73 was transition year for this. The taller water pump was introduced then coinciding w/the 4 bolt damper but early prod possible exception. 
I've gotten a belated balancer education on this thread. I'm looking to smooth out my 72 360 727 after replacing the cracked damper [w/4 bolt style] due to the major leak the previous moron's over-torquing created. Some highway vibration resulted and i went back to a 3 bolt which was slightly worse. Having no idea these were p/n for specific cid, I realize now I've got a pair of 401 dampers. With the counter weight so far off from the 360 I'm surprised the vibe is only minor. 
I do not want to tear it down just for a balance issue. If I locate the correct 360 damper will that make it better [not perfect]? Will either 3 or 4 bolt work? [pulleys not an issue] Sadly I tossed the orig damper when I moved, so match balancing is outOuch  
Thanks for any help on this ultimate resource or corrections on my info. 
Henry
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Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Jul/27/2015 at 6:58pm
Originally posted by 304-dude 304-dude wrote:

In 72 they went with a 4 bolt damper and a change in offset on the pulleys. Plus the power steering unit had changed to GM Sagnaw.
I have a 1972 304 HB that is a 3 bolt. and I have a 1972 401 that is also a 3 bolt HB.

Edited by purple72Gremlin - Jul/27/2015 at 7:01pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Jul/27/2015 at 7:01pm
Originally posted by purple72Gremlin purple72Gremlin wrote:

Originally posted by 304-dude 304-dude wrote:

In 72 they went with a 4 bolt damper and a change in offset on the pulleys. Plus the power steering unit had changed to GM Sagnaw.
I have a 1972 304 HB that is a 3 bolt. and I have a 1972 401 that is also a 3 bolt HB.I also have a 1973 360 that has a 4 bolt HB...... but I would not be surprised to see 4 bolt HB on 1972s and 3 bolt HB on 1973s.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dltowers Quote  Post ReplyReply Direct Link To This Post Posted: Aug/08/2015 at 12:03pm
Good info
Original Owner, 1974 Javelin:
360ci,2v,727TC. Motorola Multiplex with 8-Track.
G4 Plum exterior with 421Q Black Uganda Interior. Purchased on July 16, 1974 from Hooker AMC, Sherman, TX for $4500.20
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mrblatzman Quote  Post ReplyReply Direct Link To This Post Posted: Aug/25/2015 at 9:37am
Im still in the dark on iding these...I have a NOS 3 bolt one I got from the LAPD stuff, but cant find a number on it anywhere..on one edge there is a circular ground out area maybe 3 inches long that was done when it was made..So how do I determine what it is supposed to be used for....Thankyou    Bob in Alabama
Thankyou....Bob
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Post Options Post Options   Thanks (0) Thanks(0)   Quote captscot Quote  Post ReplyReply Direct Link To This Post Posted: Oct/19/2015 at 6:30pm
Looking for a 3-bolt hole damper for a 1971 401.

Since the photo of a '73 damper with 4-bolt holes has a 180 degree counter weight, would a '68-'69 damper with 3-bolt holes which has a 180 degree counter weight work on the '71 401? Essentially the same engine except for the stroke?
1972 Javelin AMX - orig owner
1985 Grand Wagoneer
1967 Jeepster
1968 Jeep Gladiator
1959 Jeep CJ5
1929 Marmon model 68
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captscot View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote captscot Quote  Post ReplyReply Direct Link To This Post Posted: Oct/25/2015 at 9:31am
1972 seems to be the transition year. In the last photo you print:

"The off-set weight goes 180 degrees on a 1971-1972 401. (3-bolt)"

Therefore, can a 3-bolt damper for a '68-'69 390 with a 180 degrees off-set weight work on a '71-'72 401? They seem identical.
1972 Javelin AMX - orig owner
1985 Grand Wagoneer
1967 Jeepster
1968 Jeep Gladiator
1959 Jeep CJ5
1929 Marmon model 68
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amc67rogue Quote  Post ReplyReply Direct Link To This Post Posted: Oct/25/2015 at 6:00pm
All the 401 dampners have a thicker outer ring, they are 180 deg. like the 68-69 390s but thicker.
Keith Coggins 67Rogue X code
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AMC Okie Quote  Post ReplyReply Direct Link To This Post Posted: Nov/09/2015 at 12:23pm
Where would you get a new one, or get one rebuilt?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: Nov/09/2015 at 1:25pm
Damper Doctors has done all my AMC Dampers....
Ross K. Peterson
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