1 x Tridon. The high flow thermostat is designed to interchange with the original thermostat. Utilizing a 30% larger opening valve, the high flow thermostat increases coolant flow and improves cooling system performance.
I'm using the thermostat in a Ford Cleveland 351 running on straight LPG. The motor now runs 10 degrees C cooler than with the standard thermostat, which is a positive in hot Queensland weather.