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My 289 will occasionally leak a little coolant when you take it over 6,000rpm. It appears to be coming from the bottom of the waterpump or the bottom hose. The harmonic balancer slings the coolant, so it seems to be coming from just above the balancer somewhere. I have pressure tested it to 22lbs for a couple of minutes and no leaks were noticed. Any ideas on what could be causing this are much appreciated. It only leaks a puddle about the size of dime/quarter then quits.
 

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Weep hole on the pump, just under the snout, sometimes hidden by the pulley.

If its coming from the weep hole, your seal has gone south, and you need to replace it.
 
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