Tuning for Elevation

[Track Junky]

Originally Posted by Sieg

Holley's jetting instructions for a 4150 Ultra HP Series:
Carburetors are calibrated at 70° at sea level. Decrease the jet size one number (approx. .002) for approximately every
2000 ft. increase in altitude. Increase jet size one number for every 35° drop in temperature.

Here's a converter:
http://bgsoflex.com/auto.html
They also have numerous other calculators

That is awesome, thanks. At least it should get me in the ball park. In addition, if I record temp reading at header primaries with current set up hopefully I could avoid a lean condition. Better yet, maybe its time to get an AFR gauge.