Those seeking to service or simply change the temperature rating of our FSM or FSC-series thermostat can easily do so with the Improved Racing FSM & FSC Thermostat Rebuild Kit. This kit comes with all of the thermostat's internals and is available in all five temperature ratings: 145°F, 165°F, 185°F, 205°F or 215°F.
Please note: Select your thermostat type, FSM or FSC, in the drop down.
FSM-145 High-Flow, Low-Temp Fluid Thermostat
FSM-165 High-Flow Transmission Fluid Thermostat
FSM-185 High-Flow Engine Oil Cooler Thermostat
FSM-205 High-Flow Engine Oil Cooler Thermostat
FSM-215 High-Flow, High Temp Engine Oil Cooler Thermostat