RE: .12 Rigger Kits for CHEAP!
On a rigger I'm Not sure Yet. in a sport .18 hydro I actually run the water through an exhaust cooler first then to the head to heat the head up, especially on the side exhaust engines, they have larger transfer areas cut in the block so they run extremely cool(it's one of the reasons people have a hard time tuning one). I restrict the water at the outlet also to let it heat up more. My rear exhaust engines dial in around 140*F and the Side Exhaust engines dial in around 110*F. In a Sport Hydro they will Overheat without water.