Those seeking to service or simply change the temperature rating of our FSM-series thermostat can easily do so with the Improved Racing FSM Thermostat Rebuild Kit. This kit comes with all of the FSM's internals and is available in all four temperature ratings: 145°F, 165°F, 185°F, or 215°F.
FSM-145 High-Flow, Low-Temp Fluid Thermostat
FSM-165 High-Flow Transmission Fluid Thermostat
FSM-185 High-Flow Engine Oil Cooler Thermostat
FSM-215 High-Flow, High Temp Engine Oil Cooler Thermostat
1 x Thermal element (145°F, 165°F, 185°F, or 215°F)