Robertshaw 370 series substitute hi flow balanced sleeve thermostat

The difference between the Robertshaw 370 Series and the 330 Series is the flange diameter.   Fits Mopar, Some Ford, Lincoln, Mercury, AMC L6 Buick Nailhead and Y blocks Why Robertshaw? Because we make a hi flow pump and its unique three port construction or "balanced sleeve" design equalizes the system pressures above and below the thermostat’s moving valve. Therefore the thermostat is pressure balanced and will respond to system temperatures only. No other thermostat does this. Other Features of a Robert Shaw Thermostat: 1) Stress-free construction. Robertshaw makes the thermostat's strut assembly from brass, not stainless steel, because brass can be bradded to the housing with heat instead of sledge hammer-like stress. This technique permits two brads per strut. Other manufacturers forcefully attach the struts to the housing with intense, metal-weakening pressure on the struts, binding each strut in only one spot. 2) The Power Pill®. This is the heart of a Robertshaw thermostat. It