What caused this?

[YENKO DEUCE REGISTRY]

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if it broke like that on the complete keyway slot, you used a key that was incorrect or too tall, meaning the same thing... LOL

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Hmmmm.... would the balancer slide onto the crank if the key was too 'tall'? I never really thought about it, but....

You might be right Sam, these are old parts so it could just be fatigue. I have your old balancer ready to install - I bought it from Pete after delivering it to him for ya! I must say, I have yet to miss a shift and completely bury the rpm's. I've never even tried to power-shift it, so I still pull my foot off the gas between gears. Ya have draw the line somewhere when it's the original drivetrain, no sense over-revv'ing it It's seen 7500 rpms, but never 9000

[BUIZILLA]

[ QUOTE ]
Hmmmm.... would the balancer slide onto the crank if the key was too 'tall'? I never really thought about it, but....

[/ QUOTE ]actually, the balancer is a snug, virtually press fit so it should NEVER slide right on. I am on my third stock GM LT1 balancer on Mighty Mouse, but mine spins on the outer shell, I have now staked the last one, and it is holding up pretty good, granted I have been as high as 8,400 rpm, 8,000 plenty of times, and shift it at 7,200-7,400 so a stock balancer is NOT happy with my methods LOL I have broken 2 ATI balancers on my Buick like yours, and that was because they were too loose on the crank snout.

JH

[Mr70]

This may be the work of the dreaded two footed,frustrated,Pennsylvania garage gremlin.
.................................

[Xplantdad]

I might as well get some use (mileage) out of my screen capture...don't you think?

[Kim_Howie]

Staking the balancer. The outer ring and inter ring together, haven't you lost the reason for the balancer??