I wouldn't go without one. They make the fan work more efficiently. I thought all HQ-WB V8 got a full shroud? Is a electric thermo fan any better than a viscous fan?
At highway speed the fan would rarely even be driving (viscous) anyway. The Horton fan clutch (they are air locked up when a thermostat gets hot enough)on the Kenworth truck I had, hardly ever came on while on the highway. You could definitely hear that fan kick in.
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