Cliff's Quadrajet Parts and Rebuild Kits
General Category => Quadrajet Carb Talk and Tips => Topic started by: novadude on April 02, 2026, 12:50:15 PM
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Chevrolets (the ones that had POE) always had the holes above the flaps. Pontiac often had them in-line with the flaps. I've seen them below the flaps on Cadillac carbs.
On my Chevy carbs, I've run the home-modified notched flaps per Cliff's book. I've also relocated holes below the flaps on one of my builds. I've never tested each modification on the same carb to see which method works best.
Has anyone ever done any back-to-back testing on this? Is it worth the added effort to relocate the discharge holes below the flaps?
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Hey novadude,
I've only had any experience with the Cadillac carbs, but if im honest, these were set up on the primary side to pull extra fuel under load.
Im guessing that you're looking for information on the secondary side POE system, correct?
Rick
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Chevrolets (the ones that had POE) always had the holes above the flaps. Pontiac often had them in-line with the flaps. I've seen them below the flaps on Cadillac carbs.
On my Chevy carbs, I've run the home-modified notched flaps per Cliff's book. I've also relocated holes below the flaps on one of my builds. I've never tested each modification on the same carb to see which method works best.
Has anyone ever done any back-to-back testing on this? Is it worth the added effort to relocate the discharge holes below the flaps?
All Buick 4-speed and 455 Stage 1 carbs came with holes under the flaps
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Hey novadude,
I've only had any experience with the Cadillac carbs, but if im honest, these were set up on the primary side to pull extra fuel under load.
Im guessing that you're looking for information on the secondary side POE system, correct?
Rick
Yes... I should have clarified... Secondary POE.