Carter BBD High Altitude Jetting

edelbrock tech line, what a joke. lol. they say that you should go up to 3 steps down, or 12%. i've found that a little too much and will lean it out. what rods and jets are you running right now? i would start at 1 or 2 steps down and go from there. a 500 edelbrock has a .086 main jet with a .065x.052 metering rod stock. if you want to start 1 step down you need a .086 jet and a .067x.055 metering rod. if you want to go 2 steps down you'll need a .083 jet, and a .65x.052 metering rod. hope that helps...........
higgs