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My harmonic balancer about spun off the engine today throwing my belts off going down the road. I need to order a new one is the 68 429 internal or external balanced or how can you tell? The one that was on it was the stock type.
 

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My 1975 block (engine) is internally balanced or I think it was called zero balanced, not sure. It has a stock flexplate and 1970 (I believe) crank dampener, which probably sells on ebay or a junk yard. It may not hurt to install a Fluidampner, but will cost $$$.
 
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