Good question! Not many people are aware of just how much 2K of elevation can change some carburetors! Since Carter sold out to Edelbrock you can download all the information you need off of Edelbrocks web site. You can also use a digital Micrometer to check your own rods by measuring the two different "steps" on the rod, this will give you a starting point to go richer or leaner on the rods, BUT I think you will get better results by simply changing the rod springs, these little springs are operated by atmopheric pressure and vacumn. Just as a point of interest, every one thousand feet you go up means 1/2 lb less atmospheric pressure. Anominal sea lever pressure of 14.7 will be 1 lb less at 2,000 feet, by changing the springs you can compensate for this slightly different pressure. However if you up 5,000 ', you will have to either change the metering rod or the jet. Hope this helps, dusty
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