Questions about compression / elevation

The best way to compensate for altitude is "forced induction", be it a super charger or a turbo charger, either will make power at elevation.

yes you lose about 3% of your power for each 1k increase in altitude....you can go with a high altitude head, or just have your heads re-cut in a shop that knows how to do it....is it worth it ?, not really unless you make it part of a complete engine work up with porting, pipes, head, etc....if you like being first on the race up the mountain against your buddy, go for it, but be prepared for the problems that inevitably go with it....for most riding, the juice ain't worth the squeeze.....put gas and oil in it and learn to ride it well is the best bang for the buck...:face-icon-small-hap

PSI used to make an adjustable Head ,loosen up the the screws and twist it’s you gained altitude to preserve your HP .
They were were called adjustable power domes I think .
They had an O ring issue , but that’s not to say it couldn’t be corrected or perhaps re engineered to work .
Maybe it was the hassle of having to adjust them ,maybe they could be electronically sensed and adjusted to compensate fir altitude changes .