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Crankshaft Balancer Application

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Old Jul 20, 2008 | 11:26 PM
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Default Crankshaft Balancer Application

Hello, folks,

I need a new balancer; the original 6" balancer on my NOM 63 327/300 met an unfortunate demise. Can I upgrade to a later model 8" balancer? I have access to a virtually new balancer off of a 1979 HD truck 350.

I know that I would need a new timing tab (timing cover is chrome with bolt-on tab, no problem). Any other conflicts (pulleys, timing mark, etc)?

Thanks in advance.
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Old Jul 21, 2008 | 01:07 AM
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From: Captain Cook Hawaii
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Ken; If all of your pulleys and brackets are stock; alt, h2o pump, crank; I suggest you have your original 6 inch rebuilt. This will keep alighnment and belt length correct/easy to maintain.
I have a recomendation if you need one. I also have a spare 6 inch with a hammered on center that could be machined flat and rebuilt if you need it.
brgds
rene
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Old Jul 21, 2008 | 06:06 AM
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Harmonic balancers are tuned to specific applications. A mismatch can result in a cracked crankshaft.
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Old Jul 21, 2008 | 11:10 AM
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Default Balancer

You may want to check with Damper Dudes in CA. I know they have an extensive inventory of balancers. They also do a great job of rebuilding the them. PM me if you can't find them through Google. Jerry
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Old Jul 21, 2008 | 11:42 AM
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From: St. Joseph Mo
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Since the 327 is neutral balanced, I cannot think of a good reason not to use the l.m. 8". You should check the TDC mark and pulley alignment.
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Old Jul 21, 2008 | 04:23 PM
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Would anyone happen to know the GM balancer part number for my application (63 327/300HP)?

...Perhaps 3896904?

Thanks again.

Last edited by kbuhagiar; Jul 21, 2008 at 09:56 PM.
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Old Jul 21, 2008 | 04:32 PM
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Engine static/dynamic balance has nothing to do with the tuning of a harmonic balancer.

The balancer is tuned to cancel torsional vibrations in the crank.

That 8in. may/may not be okay with a standard 300 engine.

Originally Posted by 67L36Driver
Since the 327 is neutral balanced, I cannot think of a good reason not to use the l.m. 8". You should check the TDC mark and pulley alignment.
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