Winterizing the boat

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The boat is a 4cy inboard
Was wondering if I can get away with taking the housing off the top where the thermostat normally is and running the antifreeze in it till it comes out the lower unit

[BigFrank]

theres more too it than that    there should bee a couple plugs on the bottom of the block     then some in the exhaust manifold/water box  some older boats pick up the water /coolant from a hose threw the hull and ya gotta get he water drained out of there also     if yours is a newer model that  runs thru the out drive   just take out the plugs in the block too get the water out put em back in and fill the high side/water pump full of rv antifreeze   most off em have a plug in the water pump or on the intake too fill it with antifreeze         I just helped my bud out at the marina on sunday   went thru all this on 4 different boats /engines