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AMC Harmonic Vibration Damper Listing |
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7172AMX
AMC Apprentice Joined: May/20/2015 Location: South Carolina Status: Offline Points: 124 |
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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 out Thanks for any help on this ultimate resource or corrections on my info. Henry
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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Edited by purple72Gremlin - Jul/27/2015 at 7:01pm |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16614 |
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dltowers
Supporter of TheAMCForum Joined: Dec/12/2012 Location: Friendswood, TX Status: Offline Points: 5827 |
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Good info
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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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mrblatzman
AMC Addicted Joined: Oct/01/2008 Location: Alabama CSA Status: Offline Points: 2155 |
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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
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Thankyou....Bob
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captscot
AMC Apprentice Joined: Feb/05/2013 Location: N Brunswick, NJ Status: Offline Points: 241 |
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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? |
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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
AMC Apprentice Joined: Feb/05/2013 Location: N Brunswick, NJ Status: Offline Points: 241 |
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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. |
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1972 Javelin AMX - orig owner
1985 Grand Wagoneer 1967 Jeepster 1968 Jeep Gladiator 1959 Jeep CJ5 1929 Marmon model 68 |
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amc67rogue
AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578 |
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All the 401 dampners have a thicker outer ring, they are 180 deg. like the 68-69 390s but thicker.
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Keith Coggins 67Rogue X code
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AMC Okie
AMC Nut Joined: Sep/09/2015 Location: Okmulgee Okla Status: Offline Points: 327 |
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Where would you get a new one, or get one rebuilt?
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401MATCOUPE
AMC Addicted Joined: May/20/2010 Location: Salisbury, MD Status: Offline Points: 5367 |
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Damper Doctors has done all my AMC Dampers....
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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar) 68X,GoPac,390,4sp,52A 69X,GoPac,390,4sp,64A 70X,GoPac,390,4sp,87A,8 70X,GoPac,390,4sp,BBO,8 70 Jav SST,390,AT,BSO 74MatX,401,AT,Prototype 74MatX,401,AT |
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