Quote Originally Posted by Henry Rifle
Man, then I better change the engine in my '93 Vette. It has aluminum heads and 10:1 compression. So does the Fast Burn 385 in my '34.
Wrong--you are referring to your static compression. I run 10.6:1 static compression in my 383, and because of the cam (CompCams 280 Magnum), I get by fine on 93 octane. But I could not run a CompCams XE-274 because it would have put my DCR over the 8.5 limit. There is a very good explanation of dynamic compression ratio here: http://www.chevytalk.org/threads/sho.../0#Post1137028