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#1
06-16-2003, 08:29 AM
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I have one of these quadrajets with the slotted secondaries, and have seen it written that these were high performance models.
Does anyone know Which year/models of cars came with these carbs? |
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#2
06-16-2003, 08:12 PM
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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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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! 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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#3
06-16-2003, 08:48 AM
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The slotted secondaries were used on many carburetors. Check the carburetor identification number to obtain the original application.
Jon. Good carburetion is fuelish hot air.
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#4
06-16-2003, 08:29 AM
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I have one of these quadrajets with the slotted secondaries, and have seen it written that these were high performance models.
Does anyone know Which year/models of cars came with these carbs? |
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#5
06-16-2003, 08:46 AM
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my 1970 Formula 400 came with a q-jet with slotted air valves.
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