Thanks Ryan, IF I was turning 12,000 I would not use plastic but I'm using the factory "non-smart spark" ignition so 8000-8500 is my max. I thought about going with the crank trigger for more RPM's but I have more now than I know what to do with. LOL We tested that type of fan to 9000 rpm in the shop before deciding to use it.
Jack Jones
Hard Case Racing