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401 harmonic balancer 71, 72 interchange

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addic View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Topic: 401 harmonic balancer 71, 72 interchange
    Posted: Dec/19/2010 at 12:02am

Anybody know if the 71 three bolt balancer for a 401 has the same balance as the newer ones(4 bolt)401 and anyone know the part# for a 401 balancer.

Thanks J.G
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SKeown Quote  Post ReplyReply Direct Link To This Post Posted: Dec/19/2010 at 12:09am
 
 I don't know the part numbers, but they are interchangeable.
 
 SKeown
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/19/2010 at 6:50am
I interchange them all the time depending on what version of the car they are going into.  Just beware that the 401 4 bolt dampener needs the longer shaft water pump whereas the 3 bolt dampener used the shorter shaft water pump.  The dampeners may be interchangeable but the water pumps are not unless they the corresponding balancer and pulley setups that match the water pump shaft length.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Posted: Dec/19/2010 at 10:39am

Thanks

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401Ambo Quote  Post ReplyReply Direct Link To This Post Posted: Dec/19/2010 at 12:17pm
I found that there are two different offset four bolt balancers and two different offset four bolt pulleys. I don't know what years used which. Had a fun time matching them up as I never heard of any different ones. The balancer I had was bought some years ago as a spare from Mopar, AMC was gone by then, and the pulley came from a friend so I don't know it's origin. Was making all kinds of spacers and tossin' belts. If you're using parts from the same doner motor,  it should match up.
'72 401 Ambassador wagon
'69 pro-Street AMX
AMX/2 (starting soon)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/20/2010 at 7:32am
I've only seen the early and late ones.  Not saying there aren't more just saying I have not seen them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amxess Quote  Post ReplyReply Direct Link To This Post Posted: Dec/20/2010 at 12:19pm
Anyone have the part#s  on the later pulleys (they are stamped on them) as I'm going to install a four bolt balancer on a 390 and need to update the pulleys.
Thanks,
amxess
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Dec/20/2010 at 12:39pm
1967 = 1st Year AMC Gen II Engine, (3) Bolt Dampener, Pulleys, Short Water Pump
1972 = Last year for (3) Bolt Dampener, Pulleys, Short Water Pump,1st year Torque Command
1973 = 1st Year (4) Bolt Dampener, Pulleys, Tall Water Pump
 
Does that sound right ?
 
With AMC V8's being used from 1973 all the way up to 1991
would imagine there being used more than only (1) Pulley offset arrangement.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Posted: Dec/20/2010 at 6:05pm
I know there are 2 different size waterpump pulleys 1 shallow ,1 deeper,have no clue which fits what.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Dec/20/2010 at 8:15pm
I have sent a'71 Damper by mistake to be balanced to a latter crank and it didn't like it. My machinist called me and told me that it was way off. I took 2 more dampers in from the latter (4 bolt) 401's and one of them balanced ok.
'68-'69 390: #31916189
'70 390: #3196925 (same part number as a '70 360 but balanced differently)
'71 401: #3211454 3-bolt(this is according to old information. I have one with no numbers at all on it)
'7? 401: #3211454 4-bolt
'73/4 401: #3216085 4-bolt


Edited by SC397 - Dec/20/2010 at 8:25pm
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