Hello!

I have a setup with large tractor radiator (50mm water hose attachment). Im counting on free circulation, so no waterpump to keep it as simple as possible. I ordered a thermostat kit from stationary engine parts, but the thermostat opening hole is very small/restrictive (maybe 1/2 inch).

Does anybody have an recommendation for bigger thermostat, that has good size opening hole. So that it wouldnt restrict circulation that much. Manufacturers dont seem to state the hole sizes for thermostats

Thanks!