*MUST READ*--Flex Fan Danger--Be very careful working on old cars

Dont like the flex fan. First made from riveted aluminum and no clutch. So you revving the engine to say 6 grand means the fan is turning 5+ grand or close. A lot of harmonic vibration can weaken the blades and especially the rivet joints. What little you gain in horsepower over a standard steel / viscous clutch fan is not worth the inherent danger. IMHO