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I broke a Cloyes timing chain, single, on a built 10:1 346ci.
It may have been install error.
I think that the bolts that hold the gear in may have backed out.
I lost the chain going about 30mph from a toll plaza and bent all the intake valves and two exhaust valves.
I personally feel that mine due to a faulty install of the chain since I also had some other mechanical problems.
There are more stock chains by far that any other brand. You're gonna get a huge number of stock chains broken but it doesn't mean the stock chain breaks "more" than aftermarket ones. It may very well be that if data is adjusted for population being sampled, another brand is more prone to failure.
IMHO, the numbers coming out of this survery will me of little value...
Q
How much HP did the cars that broke the double chains have, and what were the circumstances?
If your abusing the engine you can break about anything.
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