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Quadrajet Rebuild Tech

The primary shaft hole is one of the main areas of wear. A crack will lead to a vacuum leak, so Jet Performance automatically installs a bushing on all rebuilds and checks for cracks.
Raise Your Q-Jet I.Q. - Understanding the Quadrajet Carburetor

The primary shaft hole is one of the main areas of wear. A crack will lead to a vacuum leak, so Jet Performance automatically installs a bushing on all rebuilds and checks for cracks.  View Related Article