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I still think that a significant cause of broken water necks is excessive engine movement from old/broken motor mounts. On my 107, there is very little "slack" on this hose between the water pump outlet and the radiator. I tried to keep mine "backed off" to give it as much room as possible (also changed the motor mounts and have the copper pipe reinforcement). If you look through posts there are several instances of necks breaking while going over RR tracks, autocrossing, potholes, etc).
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