Re: How hot do Big Blocks normally run?
I installed a Hayden severe duty fan clutch (part number 2797) on the truck and it sits just a hair above 180 degrees in low speed conditions. This should help out during the summer when its north of 100 degrees. Unfortunately, the new Hayden fan clutch failed after about 25 miles...completely freewheeling. It is made in Mexico now and is probably garbage. Exchanging the one that failed to see if the next one will work. If the new one does not work I will be going with ACDelco. All in all I feel that the severe duty fan clutch is a good upgrade if it is working properly.
Here are some pics of the standard duty fan clutch and the severe duty.
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