VetteNURSE

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

Mike

7t9l82

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

VetteNURSE

Im curious as the the reason for the different sizes.

gcusmano74

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.

aussiejohn

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

George Ries

Seven inch on l48

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............

George Ries

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

aussiejohn

Thanks mate, I knew you'd know the answer.

Regards from Down Under.

aussiejohn