Since the large ASC heatsink blocks one side of the holes on any motor can... i hollowed the center area of the sink. Now air is drawn through the sink...and across the fins to dissipate heat better. I only use it on extremely hot asphalt though... where the heat of the sun radiates off of the track and into the motor through the chassis. With the holes being covered up on one side... the hot air has nowhere to escape. But usually i just run the ASC large motor clamp... and gear reasonably.
- Dave