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AMC Harmonic Vibration Damper Listing

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dltowers View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dltowers Quote  Post ReplyReply Direct Link To This Post Topic: AMC Harmonic Vibration Damper Listing
    Posted: May/06/2018 at 9:05pm
Not sure if this will help, but here are a couple of photos of the original factory Harmonic Counter Balancer that was on my wife's 1974 Javelin, build date is June 1974.
Drive train:  360, 2 barrel, 727 TC.
Looks like the part number is:    3216084....




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 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 10:27am
Raymon.....do you have it running???  That is the key, hopefully the last owner was smart enough the have it balanced.  If it was rebalanced, it does not matter what flex plate is in there, the Machine Shop would have add/subtracted weight as required and then should be fine.
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 9:51am
Originally posted by DHACKING DHACKING wrote:

yes I bought it this way 390 in it...I checked the casting # on the balancer to see if it was 360 or 390 balancer and found out they have the same casting.
I have no way of knowing where the torqeflight came from. thanx for the replies the rest is left unknown.
raymon


You can check the flex plate for identification, without removal.

There is a flex plate thread with pix. You can ID a 401 version by counter weight location and size.

You need to either post a good picture or look through the thread that i will add, for you to verify on your own.

With the inspection cover off, You will need to manually crank the engine to the drain plug hole on the flex plate. Take note to see the counter weight edge just under the converter, it may be further up and barely visible.

Here is a picture...



If your flex plate is from a 401 it will be 180° from the drain plug hole. So crank about 1/4 turn more to verify that the counter weight is barely shown through the access cover opening.

Rotate further to get a good measurement of how far the weight is from the drain plug hole. Then once you have that measurment, measure the width of the counter weight.

Here is the flex plate thread.

http://www.theamcforum.com/forum/flex-plate-id_topic4832.html

Edited by 304-dude - May/06/2018 at 9:59am
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DHACKING Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 9:38am
yes I bought it this way 390 in it...I checked the casting # on the balancer to see if it was 360 or 390 balancer and found out they have the same casting.
I have no way of knowing where the torqeflight came from. thanx for the replies the rest is left unknown.
raymon
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 401MATCOUPE Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 5:58am
Originally posted by DHACKING DHACKING wrote:

I HAVE A 1970 AMX THAT WAS AN ORIGINAL 360...NOW HAS 1970 390 IN IT.
THE CASTING # ON THE HARM BALANCER IS '70 390: #3196925.
THE PREV OWNER ALSO PUT IN A 727 TRANS.
SHOULD I BE CONCERNED ABOUT CHANGING THE BALANCER??
THANX...
CONFUSED

Raymon......the first thing to know is did the previous owner ever have the 70 360 and torqueflight combination running??   If so that could solve a host of problems issues up front....

You say you have the 70 390 in it already, so you must have already taken step to adapt the Torqueflight to the early flat flange crank.  Forget about the style of balancer, 70 360/390 used the same casting number....they did have a different balance.  BUT since 70 390 never had a Torqueflight and it sounds like some other unknowns, it should have been re-balanced with a Torqueflight flex plate (a 401 flexplate would be best choice)........honestly you have a bit of dice rolling going on.  A re-balance is the only way to ensure a vibration free installation with this combination.

If you have it all installed with the 70 390, try it.........
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: May/06/2018 at 5:11am
Originally posted by DHACKING DHACKING wrote:

I HAVE A 1970 AMX THAT WAS AN ORIGINAL 360...NOW HAS 1970 390 IN IT.
THE CASTING # ON THE HARM BALANCER IS '70 390: #3196925.
THE PREV OWNER ALSO PUT IN A 727 TRANS.
SHOULD I BE CONCERNED ABOUT CHANGING THE BALANCER??
THANX...
CONFUSED


Pre 72 cranks don't match to a TC tranny, only BW. So either one of three options can be done.

A custom kit for tranny swaps, or a swap of a 401 crank into the 70 390 block (which could be done cheaply, and very easily from the late 70s to early 90s), or by machining (70 crank to fit the TC converter, or converter snout to fit 70 crank).

I assume the flex plate should be a match from a 401 with TC automatic.

The question is can a 70 3 bolt balancer properly balance as well as a 72 on up balancer for the mix match??? To me it's negligible, as it is street driven mostly and not cracking over 4700+ RPM constantly.




71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DHACKING Quote  Post ReplyReply Direct Link To This Post Posted: May/05/2018 at 10:27pm
I HAVE A 1970 AMX THAT WAS AN ORIGINAL 360...NOW HAS 1970 390 IN IT.
THE CASTING # ON THE HARM BALANCER IS '70 390: #3196925.
THE PREV OWNER ALSO PUT IN A 727 TRANS.
SHOULD I BE CONCERNED ABOUT CHANGING THE BALANCER??
THANX...
CONFUSED
RAYMON H
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amcenthusiast Quote  Post ReplyReply Direct Link To This Post Posted: Apr/26/2017 at 9:07am
If you need help internal balancing your AMV8 rotating assembly, PM or or contact me through link below.

Link to XRV8 Race Parts website: www.amcramblermarlin.1colony.com
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jrpark22000 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/17/2015 at 8:12pm
The answer for anyone following this in the future is 360s were 240 weighted only. 

http://theamcforum.com/forum/topic74921_post677719.html#677719


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Post Options Post Options   Thanks (0) Thanks(0)   Quote jrpark22000 Quote  Post ReplyReply Direct Link To This Post Posted: Nov/11/2015 at 3:24pm

I've read through this and the countless other damper threads. I haven’t been able to find a definitive answer. 

AMC 360 dampers– did they only come with 180deg weighted, only come with 240deg or a mix depending on the year?

From what I’ve gathered from all the reading I think they were only 240deg weighted.

Why I’m asking;

I ordered a 360 short block from CME and had them order an ATI damper and flywheel so it could be computer balanced. To my surprise when I received the shipment the ATI damper they sent was the 180deg version, part# ATI917942.  I don't have or know what damper came on the motor from AMC.

When I opened the damper box there’s no way they installed it on the crank, there are no marks inside the hub or key way. There’s also new balancing holes drilled into the crank front two counterweights and another in the rear most counterweight. I don’t want to find out the hard way on first startup I’ve the wrong parts.


Thanks Guys. 



Edited by jrpark22000 - Nov/11/2015 at 4:02pm
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