Brian; thanks for the info. Let me see if I have this straight. If I want the engine to run at, like you said is best, say around 200, then a 165 degree will not be as efficient as a 180? Let me ask it differently? A 165 degree will not keep it at 165 as will a 180 not keep engine at 180? So a 200 degree will keep the engine cooler and be more efficient than than the 180? I am not completely crazy, though it may sound like it here.

54 Chevy 5 window - 46 Chevy 1/2 ton