My 60 big foot uses the same pump as a 90 2 stroke. I mapped the water pressure
with a good guage, right after an extensive cooling system repair. (part of a
longer story) It tops out at about 17-18 at WOT, 14 at 4400, 10 would be about
2800-3000. At idle it will be 3-4 but when coming down from speed it will be
lower until the thermostat closes a bit.
This is at the water jacket right above the raw water inlet tube where the
fuel cooler taps off.