[volksworld]

for what its worth "fails in the open position" isn't what you think...if the engine overheats, and the thermostat opens further than it normally would, there is a notch on the shaft that hangs up ...so when the engine cools down the thermostat remains in the open position...maybe so you can drive it further before it overheats the next time?....but they are still fully capable of failing to open in the first place...i second the Robert Shaw style...and take a good look at the Murray, it probably has Motorad printed on it...the 454 in my camper uses the smaller size (no RobertShaw available)...i bought 4 different thermostats with different descriptions from all 4 chain stores and they were all Motorads in different boxes...and 2 were defective