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A 5/8 or 3/4" garden hose fits over the heater hose connectors. Or you can buy a hose barb and put it on a heater hose.
I start by removing the thermostat and run water until it comes clean from every outlet. Also, don't forget to back flush the heater core.
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Fred
There is no such thing as too much cam...just not enough engine. 
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