===>  Thanks for the comments on the Water Wetter additive.


 Of course if I don't, I have to plug that hole
somehow.  Can that be done with the housing bolted in place on the engine?


Thanks in advance for any thermostat advice.  I was just about to install
the thing, but maybe I'll hold off a couple days.

Cheers,
Rusty


Rusty, you can plug the hole with the water pump housing on the engine.  You
will need a 1/2" NPT tap (if memory serves me right) and I find a socket
that will hold the squared end of the tap.  Then using an socket extension I
can put the tap into  the hold and cut the threads for a plug.  Suggest
suffing some cotton with vasaline coating or other means of trapping the
metal chips below the hole you are tapping.  Then flushing it good with a
hose.

I tried a thermostat twice and could not get it to cool properly on the
ground in either case, so gave up and have flow 200 hours with no thermostat
and no problem.


Ed Anderson