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Old 06-25-2008, 05:04 PM
75gmck25 75gmck25 is offline
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The threaded hole on the back side of the carburetor (I assume its a quadrajet) is for the line to the power brake booster. You can plug it if you don't have power brakes.

The three ports on the front of the carb are usually the PCV valve (larger diameter line), vapor recovery canister (usually on driver's side), and line to the vacuum advance (probably ported vacuum, but might be manifold).

Bruce
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