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Flushing the block is removing the thermostat and using a water hose, flushing water backwards through the coolant passages. The hope is to remove as much crud and crap as possible.
If you head gaskets are not leaking I wouldn't pull the heads. If it aint broke.............. If you decide to replace the gaskets I have used Fel-Pro gasket on my 6.2's for 20 years with great results. Swapping a 6.2 for another one is like stated above. Pretty straight forward. It took me a...