Agreed...unfortunately my bilge heater does not arrive until tomorrow...and tonight in NC is going to be record cold.
The garage is subterranean on three sides...so I am probably overly concerned.

^^^ I'll do this soon!

i think GETRDUNN posted this how to do,,,i added 3/8 pipe to AN 6 fitting, then 16-18 inches of number 6 stainless, then AN 6 fitting and cap plug.
works great ,as before my closed water system was added , it was really hard to reach fitting on side of block, and now with closed coolant system , i can t reach anything on STBD motor,,so works great as fitting / plug lay in front on motors.

DRAIN THE MOTORS...

I have open cooling and big blocks in a Formula. Its tight in the engine bay but I will retrofit a system...I just need to learn more about the boat/motors.

I've always drained mine or pull the thermostat and dumped anti freeze in the block.

My kept a light in his boat but lost power during a winter storm one year and it cost him a 454. After that I won't take chances on being dependent on power.

My storage garage up here (North Carolina) this year did not get below 50F but I need to figure out how to do this.
I might get one or two cold snaps in Pensacola (boat will be on lift over water)...but "boatable" weather come all year round. So I don't want anything too finite/permanent/expensive.

As nice as your boat is, and as much as you plan to use it, I would put closed loop on it and only have the exhaust running the salty crap through it.

When I get it down there I will use your experience and investigate that option.
Tom

send you PM.............