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4200 Damper size
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69763
05/13/12
02:20 PM
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bristowbob
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Can one of you 4200 guys tell me the diameter of the harmonic balancer? Could be a clearance issue. Thanks
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Re: 4200 Damper size
bristowbob
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69764
05/13/12
02:34 PM
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efi-diy
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GM used 2 designs. Which year engine are you working with? Guess you are asking for the OD?
The design changed sometime during 2003.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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Re: 4200 Damper size
efi-diy
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05/13/12
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Yes, I'm interested in the OD. I have not sourced and engine yet, but I hope to find something 2005 or later. Are the dampers interchangable? Smaller would be better for me.
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Re: 4200 Damper size
bristowbob
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69826
05/16/12
12:24 AM
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2004 up 8.1"
This is the smaller of the 2 sizes. The drive pulley is part of the damper and is about 1 5/8 thick.
Last edited by efi-diy;
05/16/12
12:26 AM
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51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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Re: 4200 Damper size
efi-diy
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69846
05/18/12
01:26 AM
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The damper is about 1 5/8 thick, the pulley is cut into the damper as a 6 rib micro grove belt at the side closest to the engine.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them
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Re: 4200 Damper size
efi-diy
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69847
05/18/12
08:24 AM
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Thank you very much. That's exactly the info I was looking for.
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