Rhoads Lifters On Solid Lifter Cam - Setting Valve Lash

nm9stheham said

1000-2000' is not enough to make me think the engine has an issue with the same compression range. Used to drive a high compression engine from 1000' to 2200' every day. I have noticed the same changes going from 1500' to to sea level, and a bit more tendency to detonate. And going to 5000' is indeed a big change..... "What's gone wrong with my motor?!?" LOL

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Yes in a bout 1980, I drove the same 66 cuda to the West Coast. It the time I had no clue about elevation and its effects. I remember the car running sluggish over some high elevations in the Rocky Mountains. I pulled over at a rest area and remember checking it over and....??? nothing I could see. Then coming off the western side going down in elevation car just picked up power again. 66 cuda
has a factory vacuum gauge it comes in handy.