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Ok, What are my chances on cleaning up salt plugged block coolant passages?

Yes. Like they say, you don't really get to know your boat until you there is a problem.
 
Specific Problem: A circulating solution of salt-away in water loosened the plug so that it could be blown out with hose water pressure.

Prevention: Flush valves to insure a good flush through the engine on hose.
 
That is a big clump of sand. Are you confident you got everything around the cylinder walls?
An update: It's not sand. But the quick answer is "No". What I've found is that is the past 4 times I've tried to go out more of the crap flushes out and plugs the thermostat. Pull the thermostats and clean, flush, then ok. But next time going out a week or so later more crap plugs the thermo again. Flush & clean, repeat cycle. It will eventually all come out. If you read the Salt-Away lit that's how it works.
 
Why do you not want to try crankygypsy's closed loop flush??
 
Do we have an update to this by chance? Finally inspected my anodes and they were shot. I was trying to think of a way to just flush or descale the area around the water jackets. Has anyone done this?
 
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