Because a raw water cooled boat engine may not be completely full of water.
And a block heater would probably not reach the exhaust manifolds and risers
even if everything was full of water.

wrote in message
ups.com...
Why not just use a block heater?

Bryan wrote:
It's going to be below freezing tonight in an area where winterizing is
optional. I chose not to winterize so that I could use my boat on the
nice
days during the winter.

My friend told me to put a 40 watt utility light in the engine
compartment
for cold nights. So, I leave a 40 watt bulb burning in the engine
compartment of my Sea Ray 185. What do you think of this winterizing
solution?