Quote:
Originally Posted by NHRABill
changing the jets from stock may be a mistake. too small and the back bores may need to open sooner. Just play with the a/f screw if you think you can lean it make sure you keep a close eye on the temp gauge and look at your plugs listen for detonation and pinging.
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2 things based on my experience with the Q-Jets:
-The secondaries main throttle blades are mechanical, opening around 70% throttle. It's only vacuum in the sense that the upper blades open with vacuum, but air is ultimately throttled by the main blades at the carb base.
-The tuning needles are idle air mixture screws, they won't effect the upper rpm range. Anything else and you'll have to play with jets and needles. You can adjust fuel curves with different needles.