340-6pac Dyno

March Underdrive pulleys.......I know that that slows it down a bit.....but the stock 8-blade AC unit is better than the Flow Kooler.......now if I was going to go aftermarket again I'd get the Milodon or Edelbrock unit. Like I said I haven't had any problems with it but I'm not impressed or sold on the fact it is better than the stock one.