05-20-2008, 11:32 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Yes Chuck it is a 50 oz imbalance. I think all the 28 oz were 3 bolt, and the 28oz do not have that large or design of a void.
If I had to speculate as to why it broke, I would say that the key was not installed properly into the machined area in the crank. Therefore with one end of the key to high and not centered in the machined relief of the crank when the balancer is pulled or pressed on, with the key standing too proud the cast iron of the balancer unknowingly cracks.
often times aftermarket cranks have the snout machined a few (.0005-.002) oversize which requires the balancer to either be honed or the snout massaged to get the right fit.
This assumes the correct key is being used.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 05-20-2008 at 11:52 PM..
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