I have a Crusader, Charger Series 250 h.p. engine which is
from what I understand a 1967 Chevy 327 5.4 liter, in a
houseboat that has an inboard drive. I have drained water
from the petcocks on the engine water pump and also
from what appears to be an inline pump that has two lines
for cooling the differential gearbox. The one on the inline
pump finally stropped draining water, but the one on the
engine water pump kept on and on and on...to the point
that I don't see how the whole system could hold that
much water. Could it still be coming as I drain it out? If so,
what to do about that?

Also, somewhere I got the idea that it's good to open the
system where the thermostat would go and fill it with
anti-freeze, to take care of pockets where water could
still be trapped and maybe even to keep gaskets etc
from drying out. Is that something I should do? If so,
would a 50/50 mix be good enough?

Thanx for any help!
Loo