I have had very good experience with the Ford Truck Thermal clutch and a 7-blade steel fan, running the fan as slow as I could find pulleys for. That 367 sees 7000plus, every time it leaves the yard, and many other times besides.It's been on there for at least 10 or 12 years.I never hear it; Whoosh... maybe it has something to do with the dual 3 inch pipes.
