Aluminum heads
I've read this article before, and the writer agree's with my take on their data.....that it is NOT definitive at all. This single point test really was just filler (like Freiburger said in the last sentence). The cam was big, which bled off cylinder pressure, making it so that there was really no danger of the engine detonating. A proper test would have involved changing variables that actually may have had some bearing on the hypothesis (like using lower octane fuel, smaller cams, etc).
