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I just received my fan. I thought the viscous fan kits were a five blade fan, however I received a six blade fan. Also there is a sticker on the one fan blade that states that the maximum rpm for the fan is 4,000 rpm. Is this right?



On the max RPM, I understand the viscous drive acts as a speed governor when engine RPM gets high. As a general observation this basic setup is used on a lot of warmed up engines, mine included, without problem.