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[ROCKLANDTOYOTA]

Originally Posted by Jason@SportsCar

So I had some time to play with this some more while I had two engines sitting on the garage floor. I put both thermostats in a pan on the stove and heated them up to get open and closed lengths.

The Stant MR2 unit will fit. The only issue is the bypass will always be closed - with the stock thermostat the bypass is only closed when the thermostat is open.

So does anyone know what function the bypass has?

"bypass valve regulates hot coolant into the heater core when you're using the heater or AC."-found USING GOOGLE....