Indmar 160 degrees marine thermostat part # 985009. Used on the majority of Indmar engines like the Indmar Monsoon, Indmar MCX, Indmar Assault, Indmar LT3R, Indmar Hammerhead, and many others. One exception is the Corvette LT1 engine, use Indmar part # 986034 for that engine.
Older engines equipped with a 143 degree thermostat can use the 160 degree thermostat.