Made in the USA
351C, 351M & 400 engines
This is the identical thermostat as the famous “Robertshaw 333-” thermostats. The Track Boss thermostat is manufactured by the same company that currently makes the current Robertshaw thermostats.
If you have a 351C engine, make sure you are using the by-pass plate. The Track Boss thermostat WILL work with the OE by-pass plate. (this plate is NOT used in a 351M/400 blocks) If you need a by-pass plate, you can add the by-pass plate and get FREE shipping in the US.
***Quick temperature guide…We can not advise what you need to run, but this is how customers have been ordering. %85 are 180 temp, 160 seems to go in race or street/strip vehicles & 195 seems to be installed in daily drivers like the 351M/400 trucks/vehicles***