I will be starting the season out with a gas motor, what size radiator should I use ? I can only fit up to a 25"radiator in my chasis, how mutch cooling difference will there be between a 22" double pass, 22" single pass / will either of these work for a gas motor or should I go to the 25"radiator 2nd should I use a 4light or 5the blade fan for optimum cooling email or text me your thoughts.beesboytoy@AOL.com / 6073681306 thanks.