Here is a BRAND NEW Robert Shaw high-performance thermostat for a Chrysler engine or a Ford FE Series.  (See Cross Reference List below.) This will fit any Chrysler small block engine, including those found in Dodge and Plymounth vehicles. This is a true 180 degree thermostat and considered by many to be the best. They are very reliable at helping the cooling system maintian the intended temperature range for your Mopar.

Cross Reference List:
Chrysler 318 340 360 383 400 426 440 V8
DeSoto 361 383
Dodge 273 318 340 340 360 383 383 400 413 426 440 V8
Ford 352 390 400 427
Mercury 352 390 406 410 427
Plymouth 273 318 340 360 361 383 400 426 440 318 360 400 440

Why buy Robertshaw thermostats?

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 detects minute changes in the temperature of the coolant, and quickly activates a precision-engineered stem or piston to open and close the thermostat valve.

3) One-piece bypass poppet - With other thermostats, the bypass valve stem is welded on. The weld tends to fail under stress. To eliminate this problem, Robertshaw manufactures the entire copper cup and bypass stem from a single piece of metal.

4) Short-stroke piston - In conventional thermostats, the piston must make a large stroke to open the thermostat far enough for adequate coolant flow. But the long stroke compromises durability. Robertshaw engineers achieved a shorter stroke with a uniquely-designed flange and poppet. This design increases the longevity of the thermostat, yet still allows adequate coolant circulation.

5) Contoured strut - Making the strut assembly from brass instead of steel provides another benefit: brass, being more malleable than steel, can be precisely formed to maximize coolant flow.

6) Uniform quality - Robertshaw builds all thermostats to OEM standards -- so your replacement thermostat is identical to those used in new Fords, Chryslers, and other cars.