Finally found an old (very old) article that discusses this exact issue. Apparently the only real way to solve the "lean at full acceleration" issue without disturbing the cruise afr, is to enlarge the enrichment circuit from the power valve, i.e. drilling out the passage to a slightly larger one. Probably not worth the effort in this case, as full throttle pulls are rare for this rig. I may pull one of my 2100's off the shelf and give this a try just out of curiosity.
Thanks for the replies.
You need to pull off your carb, and figure out what number power valve you have now, and then consider what your altitude is, and at what altitude you want to tune it to run at. For example, You cannot test it at sea level, correct the tune to sea level, then expect it to run optimally at 5000 feet, it will be too rich.
When racing we would tune to the density altitude. The dry desert air at Las Vegas was way worse for making power than the power produced at say Pomona, Sacramento, or even Phoenix. The tracks made up for the lack of power by adjusting the class index to keep a level playing field.
You don't need to drill out anything in the power circuit, just select the correct power valve for your density altitude, and run a couple sizes smaller main jets at high altitude. The carbs were originally very lean at idle to meet federal emission standards, at sea level you might be a little lean, but they will be fine at the higher altitudes.
You also can run more total advance (initial timing plus distributor advance) at the higher altitudes. When tuning, it all works together as a system.
John
