For what it's worth, my advice.....keep the compression on the low side. You will never hear the detonation before it breaks stuff.
x2. Modern stuff does more than just retard timing to keep the engine from pinging, most of the engines that have high cylinder pressures (either high comp NA stuff or boosted applications) will limit engine load to keep them out of detonation. I don't know of any mass produced OEM car engine that is much past 12:1 NA. On a high output motor it isn't worth the risk.
