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Harmonic balancer size

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Old Jan 17, 2013 | 06:06 PM
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Default Harmonic balancer size

Does anyone know what size the harmonic balancer was in 1976 for the L48 and the L82?

Mike
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Old Jan 17, 2013 | 06:18 PM
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the L-82 used the large balancer 8 inch which was also used on the LT-1 and the 350/350. others used the smaller balancer
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Old Jan 17, 2013 | 08:00 PM
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Im curious as the the reason for the different sizes.
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Old Jan 17, 2013 | 08:55 PM
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The L82 engines used a forged steel crank designed for high RPM use. The larger balancer was used to control the vibrations at those higher speeds. Probably overkill on a street engine, but it had "image".
The base engines used a cast ductile iron crank, had a lower redline, and used the smaller, lighter balancer.
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Old Jan 17, 2013 | 10:45 PM
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Default Interesting..............

G'day,

No hijack intended, but I have a '74 L48 on which the outer ring of the HB has slipped. I bought an Australian built PowerBond HB which is 8" and plan to fit it shortly along with a new oil seal. I can't imagine that the bigger HB will have any ill effects on the engine, but by asking the question here, I know I'll get a well informed answer.

Thanks guys.

Regards from Down Under.

aussiejohn
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Old Jan 18, 2013 | 12:21 PM
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Seven inch on l48
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Old Jan 18, 2013 | 04:59 PM
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I think you will find 8" balancers on both motors just a thicker one on a L-82 application but, what the hell do I know............
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Old Jan 19, 2013 | 01:39 AM
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Originally Posted by Solid LT1
I think you will find 8" balancers on both motors just a thicker one on a L-82 application but, what the hell do I know............
i just went out to the garage and measured the one i took off my 76 L48 it was seven inches im assuming it was the original one that came with the car
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Old Jan 21, 2013 | 01:01 AM
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Default Thank you.

Originally Posted by Solid LT1
I think you will find 8" balancers on both motors just a thicker one on a L-82 application but, what the hell do I know............
Thanks mate, I knew you'd know the answer.

Regards from Down Under.

aussiejohn
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