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Why is my replacement balancer bigger

pudd

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Nov 5, 2005
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Tennessee
Why is my replacement harmonic balancer bigger than the original. Is this normal or is Auto Zone handing out the wrong parts again.
 
Depends on application . I just replaced one , and had to take off the factory timing tab , and use a new one to match the balancer .

Look at replacements on summit or jegs , they list a couple sizes so you can match what you have .
 
It is on a 1989 350 throttle body injected engine the replacment balancer looks like it is the size used on the carbureted engine. Any idea?
 
Just measure your old one , and get a new one that size . Its not hard at all . Call a speed shop , or engine builder , or look online .

Most parts stores are good for the stuff we need a lot , like spark plugs , bearings ,brakes etc . But I would not buy engine internals , carbs , balancers , or any stuff like that there .

BTW , there are several sizes available I can rattle off , 6.25 , 6.75 , 7 ( not common ) , and 8 inch .

And there is internal , and external balanced . Yours is the first type if its stock .
 
we've been over it before, pretty certain all Single piece rear main motors are externally balanced. If thats correct, just replacing the balancer could be a bad choice. I mean it could run forever or vibrate like mad and wear out bearings in a week.
 
One piece rear main motors only use a weight on the flywheel or flexplate.
 
The original balancer is a 6" and the replacement is a 8" they are both internally balanced. The 8" fits ok and does not affect the timing pointer. all is well. I was told as long as both balancers are internal balancers it will work.
 

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