[Tommy]

I assume you are speaking of the engine coolant temperature being "too hot for my liking." If so, first know that with the correct coolant mix and system pressure, you should not be too concerned unless the coolant temp exceeds 110C. If mine hit 115C I'd shut it down.

Know that three basic things affect engine coolant temps: 1) the amount of heat transfer provided by air flowing through the radiator; 2) the effective circulation of coolant to move heat from the engine through the radiator; and 3) the amount of heat being generated by the engine. If we assume your coolant system is working properly (e.g., proper water pump and radiator, no collapsed water hoses, etc.) and your recent addition of a shroud is assuring good air flow to the radiator, then the next logical place to look is the engine. Much of the heat generated within an engine goes to propelling the car or is expelled through the exhaust. But an improperly tuned engine can generate heat that merely goes to heating up engine components. The two most common causes are a lean running fuel system and/or incorrect timing. So, I suggest you make sure the engine is properly tuned for all running conditions as your next step.

Note: The standard water pump rotation for a LS1 engine is CCW.