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Originally Posted by Chevy55
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Years ago I learned, or should I say didn't know I learned, that a properly turned carburetor(s) for the most part takes the same jet at all elevations. The key word is PROPERLY. I would scratch my head thinking this can't be correct. I would change jets on my 6 pack and would end up at the same place all the time. Then, I read the article in the National Dragster from David Reher. A light went off and I thought.....that's what I have found to be true. It just took someone that knows their stuff for me to believe it. Air goes down the venturis and pulls fuel. More air more fuel. At altitude less air pulls less fuel and therefore leans the carburetor naturally. I remember years ago going to Denver with my 6 Pack Challenger. All we did was unload it and race it. I qualified #1 with the same tune-up as sea level. Granted a 6 Pack runs really well in altitude. I'm sure with gear, converter, cam and tire size changes ect. it would have ran better all without touching the jetting. .