Brad Roberts is the guy to know the answer to this but I haven't seen him on the board lately- mine was done before the motor was put back in so I can't help you. If he doesn't respond in the next couple of days I'll email him and wake him up.
PS in my experience (and my car runs in the hottest of conditions) when these cars are used as race cars (ie they are never idling in traffic) they really don't need either the engine fan or for that matter the cooling fans. Weight is weight and if you don't need it is has no place on a race car.
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