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JimA=> Even if one side was not working right wouldn't => it still pull in the same amount of air per stroke? If the butterfly's in the wrong position, it'll impede air flow, and at speed this allows less air into the cylinder and pulls less fuel. Carb sync is primarily equalizing air flow; air flow controls fuel flow, assuming the carbs are set up the same. => like a valve not opening, or a vacuum leak. These are certainly possible, although an ordinary manifold leak wouldn't cause perceptible power loss. A valve stuck *closed*, on the other hand ... severely messed up valve train. => I'm thinking that he just had a valve adjuster come loose Always the first thing to check. Steven Ayres, Prescott AZ '66 343 ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org