Yes I agree on the aluminum block ring seal, I meant more of the examples of observed power difference when switching from iron/aluminum heads. (as in what difference would there be other than heat).

I think Meaux finding that the SS Hemi picked up more than his SBC may be due to the massive chamber of the Hemi?


And good point on the driver! I had a customer return his LT4 Corvette (factory supercharged engine) for me to look at, stating it was pinging. (so this is about 1200-1600rpm)

I couldn't duplicate the issue until further discussion, found out he was going WOT in 6th and 7th gear (manual trans) on the highway instead of downshifting.

Amazing how many people with performance vehicles absolutely lug the hell out of them. Makes me cringe.

I would never do that but let me adjust timing in those cells (down to almost nothing)