+1. Plus, wih the low compression of the 216 I really cant see how detonation could ever be a real problem with modern fuels. Unless of course the timing was WAY off (advanced). I recently purchased 1964 Corvair Monza Spyder Convertible (been sitting for over 25 years, still not running as I am going through the fuel system now). The turbo corvair engines are VERY suseptible to detonation and most of the Corvair gurus (and major part suppliers) recommend the extended tip spark plugs. Just sayin....
