>>25772507>vastly overestimating the effects of altitutde.
They do make less power but large populations drive identical cars above 5000' and have for a century. Altitude is also mitigated by large displacement, large port, low-revving engines, say like an LS V8. 4-cyl with smaller ports that rev very high but are renowned for 'throttle response', like a Honda, do particularly worse in lower ambient pressure.
There were actually only a few American V8s made with ports so wheezy that altitude affects them, mostly in the 70s and 80s.
As always, the argument is, in the usable band of power, and a big displacement V8 has a larger band of power and so is affected by other factors less. If you have a smaller engine, you have to fight harder to get that power band, and it is always always always compromised by forced induction of any type, which always comes with major compromises requiring major extra systems to function perfectly or else.