I do hope that all of this stuff ends up helping others as well as myself. I have read archived threads on this and many other subjects in the interest of learning. My understanding is that while Mopfried has a good point about the bigger cam making more cylinder pressure at high rpms, maybe the short time span at that high rpms makes detonation less likely?? Don't worry about anyone thinking your post was hijacking anything. I am open to all points of view.
Anyhow.... I found a Dynamic CR calculator that has that odd "Intake closing PLUS 15 degrees" bit:
Using that calculator, the '509 gave me a 7.91 Dynamic ratio. The Lunati gave a 8.09. I was told that a dynamic at 8.0 or below was good enough for pump gas. Maybe they mean 93 octane?
