Lotsa stuff I didn't know about the Impala in there. Pays to know the competition. The numbers that I had came from the book, as far as the 10.5:1 CR. Running a 200shot on iron heads and 10.5:1CR (like the book suggested) would be a receipe for a junkyard on just about any engine. Iron heads retain more heat, that is correct, which gives more power than the aluminum head everything else being equal, but since they retain more heat they are much more prone to detonation.
You've had 120 passes on the current setup? Interesting. I'm suprised the engine is even running.
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