When I built and dynoed it the first time it was in Ontario, CA which is right at 800 Ft. I lived up in Hesperia,CA which is around 3500 Ft. I moved to Bend before the car was driveable and did most of the final tuning up here in Bend,OR between 4300 ft and 180 ft at Woodburn drag strip. I did put a wideban on the car and used it for testing the timing, spark plug heat range and the outboard jetting I never had to change the jetting for different elevation, I should have, but it ran fine so I didn't