If you could find an aluminum isolator with teflon gaskets that would work,like the ones used on Zenoah,RCMK and Sikk boat engines.These seem to stop heat transfer.I had them on my Zenoah and Sikk powered r/c boat engines.Does any company make them in aluminum for airplane use that has the twister type like the one made by Wacker Engines ? http://www.walbro.com/parts-service.aspx