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If the coolant temperature at rear cylinders is 190-195 there would be no reason to do the bypass upgrade,the rear cylinders run much higher than the temperature gauge and thermostat on front of the motor.

Found something different tonight, four seasons # 84908. Would make a DIY rear head bypass easier or give you an extra sensor port.

Hot coolant runs thru heater core summer or winter, there is no shut off valve when it's warm out.

It's more about taking heat from where you want it the least and routing it to where you would want it the most.

Input welcome.

Since the 2 rear cylinders are the hot spots in the coolant system would it be beneficial to run a rear cylinder head bypass system right in to the heater core input? A few years ago I had read somewhere about the rear cylinder head bypass system and I found the threaded plates that bolt on the...