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I think the dirves and exhaust water jackets will fill with thermostat closed but not the block.

I used to use Hammer's method. Remove the thermostat housing and thermostat and dump the antifreez in there.

Don't run it long with the water drained. Even if some antifreez makes it to the block with the thermostat closed it won't be enough to cool the heads.

I'm sure BoatUS or West will have a mercruiser manual that will tell you there recomended process.
 
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