Robertshaw 333 Series hi flow balanced sleeve thermostat with bypass plate

The Robertshaw 333 series thermostat has the distinction of being the only available thermostat that would accommodate the 351 Cleveland Controlled bypass system*.  A 351C provided greater water flow in the engine for a faster, more even warm-up without creating hot spots (particularly in the valve area). The bypass design controlled the water flow and temperature with less cycling and increased the flow to the radiator for improved cooling performance.   It was an ideal solution for overheating 351C found in mustangs and hot Panteras.  The OE Robertshaw thermostats for the OE bypass is available again.  Its made in the USA.   *The 400 and 351M had this feature cast into the block and did not utilize this brass bypass insert.  The cast bypass hole requires the 333 series. Year Make Model Eng CID VIN 1978-1979 FORD BRONCO V8 351 H 1984 FORD BRONCO V8 351 H 1970-1971 FORD COBRA V8 351 M 1971 FORD COBRA V8 351 H 1970-1974 FORD COUNTRY SEDAN V8 351 H 1972-1974 FORD COUNTRY S