Question: 25% underdrive pulley

[Pro Street]

When I did my cam,valve springs and headers I installed a 25% underdrive crank pulley.My car is running about 20° warmer now at highway speed and idle.Are any of you guys seeing the same thing?

 

[zagger]

Does the pulley drive the water pump? :confused Unless you run an electric water pump the under drive cut the pump output by about 25 percent .

 

[Pro Street]

Does the pulley drive the water pump? :confused Unless you run an electric water pump the under drive cut the pump output by about 25 percent .

Yes it drives the water pump.