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still shakes after balance

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Old Oct 1, 2007 | 05:51 PM
  #1  
demon138's Avatar
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Joined: Jun 2002
Posts: 265
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From: Alice, TX
Car: 89 Pontiac GTA Trans Am
Engine: T.P.I. 383 Stroker
Transmission: Monster 700R4
still shakes after balance

i have a 383 ,when i put it together i used the stock harmonic balancer and flexplate and it shook bad.i got it balanced and the guy said i needed a 400 balancer but nothing about the flexplate, i put it back together and shakes a bit in idle, not smooth like the factory motor, is also 10.5 to 1 comp ratio and i have poly mounts on engine and trans. any comments
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Old Oct 1, 2007 | 06:21 PM
  #2  
Apeiron's Avatar
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Joined: Jan 2000
Posts: 20,981
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: still shakes after balance

If you needed a 400 balancer, you probably should have needed a 400 flexplate as well, unless your engine is some kind of perverse creation.
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Old Oct 1, 2007 | 08:13 PM
  #3  
demon138's Avatar
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Joined: Jun 2002
Posts: 265
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From: Alice, TX
Car: 89 Pontiac GTA Trans Am
Engine: T.P.I. 383 Stroker
Transmission: Monster 700R4
Re: still shakes after balance

he builds lot of engines, and he balanced the set with this plate. will it be unbalanced with the new plate?
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Old Oct 1, 2007 | 08:15 PM
  #4  
Apeiron's Avatar
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Joined: Jan 2000
Posts: 20,981
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: still shakes after balance

Those are questions that only he can answer.
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