My brother and I built a series7 with a Jabiru 3300 engine. The only time we have high cylinder head temperatures are during climbs in 90 degree plus weather.We also replaced the Bing carb with an Aero Vee carb because we had problems with uneven air flow to the engine. We have more problems with high oil temperatures during cruise in hot weather. We have flown to Oshkosh two times and plan to fly the 1400 nautical miles to the Kitfox Flyin this September.