As has been correctly stated here, detonation is complicated and no single statement will solve it and there is no magic number that will keep it from happening. Just bought my wife a new, "used car". 2018 little Mazda. Static compression 13.2:1 . Regular fuel 87 octane engine. Of course, all the modern electronics and direct injection. I mention this as an example that compression alone does not determine detonation. Internal shapes, piston, chamber, valves, ring pack all play a role. Of course super precise fuel and ignition control as well and variable valve timing. Our old muscle cars are crude and as mentioned, very few are 100% stock anymore. Almost all that are being driven have been rebuilt to some degree. If we want the same, stock look as OE, there is no reason not to use what we have learned over the last 60 years to improve engines ability to run on pump gas available today. Lowering the compression on pre 1971 engines may be part of the formula while raising the compression on post 1971 engines can be done without detonation. Yes, agree it is complicated. Blank statements won't solve this problem.
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