Fuzzy Math

TQs, AVS, AFB & QJs are all mechanical secondary carbs, ie when the throttle is stomped, all 4 t/blades go to the WOT position. With a Holley vac sec carb, the sec t/blades do NOT go the WOT position when the throttle is stomped. Yes, a bit confusing but it was Holley who coined the phrase 'mech sec' when they introduced that line of carbs. All carbs work on vacuum or negative pressure.