Vacuum Secondary Conversion

Newbomb Turk said

Cooling system, ignition timing and curve, carb selection/tuning, flywheel weigh (for those of us who can operate 3 pedal cars) and chassis/suspension.

All of that conspires to allow unorthodox compression ratios.

Notice I didn’t mention cam timing??

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This sounds like a very iterative approach, and empirical Meaning, a lot of trial and error with some good basic foundation. This must be especially true for chassis, tuning and rear gear ratio and cam design. Meaning more experience than plugging everything into a computer program and getting an output.