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Clutch fan is better, and stick with a shroud.
I know, it prompted me to immediately remove the mechanical fan and re-install the Jaguar clutch fan with a shroud. 5% (+/-) power loss on a 600-hp engine. Well, it could be much more, just re-watched the episode, they shut it down at 5,000-5,200 RPM. Here is an article on how to change the thermal clutch fan engagement temperature range: http://midamericachevelles.com/tech/fan_clutch_adjust.pdf
I have a clutch fan in the garage, I’m now motivated to install it and see if it keeps the temps in a similar range as the mechanical. I’m still leaving power on the table, but hopefully less than 30hp.
Great, the problem most of us had is the thermal clutches (that fit our cars) aren’t necessarily designed to fully engage under 195* F. When in reality, we would want it to fully engage around 180* F (or less) to keep engine operating temperatures down at idle (keep it as close to the thermostat or minimum desired operating temperature as possible). The Chevrolet article makes a good point, that even the reproductions aren’t rated the same thermal lockup temperature as the original.