[Jmar]

I have 10:1 compression AL heads,36 degrees timing and run 94 pump gas. No detonation problems. I could have gone up to 10.5 easily. Iron heads will be a little different since they retain combustion heat. If your cam has enough duration/overlap, you will bleed off cylinder pressure at lower RPMs to reduce the chance of detonation. The lower RPM range with part throttle acceleration is where the older high compression engines would have detonation problems. If you use a cam that develops high cylinder pressure at low RPMS AND you have a higher static compression ratio, you may have detonation problems.

Does anybody have dyno #s to prove that these mixtures will improve performance? Has anybody compared the cost of these mixtures to other mechanical methods of adding power? If I weighed the cost of additives against a cam or a blower, I think that mechanical improvement would be more economical in the long haul.

Just my .02