Pontiac q-jets used slotted secondary flaps until 1975. Most of the 75 and newer Pontiac carbs had solid flaps and the fuel supply holes directly in line with the flaps so they are exposed to the underside of them. The slotted flaps in the early carbs are actually a bit too large and let in a lot of air when the secondaries are quickly opened. In actual operation the fuel runs almost directly down the inside of the secondaries, the large slots are not needed. We've had much better success using very small notches or relocating the fuel supply holes under solid flaps....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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