I run a Aluminum cross flow I picked up on ebay with a puller fan. All in all a real good deal and nice piece. my RB20 NEVER gets hot with this rad, in fact the only time the fan ever turn in is if Im sitting in traffic. The temp is always stable.
To make sure there was no interference with the fan housing I cut the top puly way off the crank pully. It was just extruded out from the crank anway and wasnt a part of the dampener.