Best to drain the water out of the block first before antifreeze. On my engine ( and I think most engines) there is a capped off tube just behind the alternator belt. I connect a piece of plastic tubing to this tube and blow in it periodically to allow all the water to get past rust and other particles that tend to block off the flow. I keep draining until I hear gurgling during a blow. I then suck in a gallon or so of antifreeze (via the hose that connects to the cooling through hull) so that it pushes out the water in the water lift muffler and replaces any water in low points of the exhaust hose. I kill the engine by pouring Marvel Mystery Oil into the flame arrestor on the carb just before I get to the bottom of the antifreeze bottle.
This procedure assures that only full strength antifreeze is in the block and not diluted antifreeze.
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Jim Zeller
1982 Catalina 30
Kelleys Island, Ohio
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