Originally Posted by shootitup (Post 3540375)

RUn first antifreeze throw engine via drive. After that open main water pipe wich comes down to up to the thermostat hose and drain block.

After block is empty fill it with antifreeze by straining antifreeze
to main pipe so long that antifreeze comes out from thermostat hose.

After that block is full of antifreeze wich also protects against corrosion. Put main pipe back to the thermostat hose.

Done this many boats/inboards many years and our winters are cold!! -30 celsius degree, allways work !!