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The story I heard regarding this issue is that overheating and burning valves had always been the biggest reliability problems in early volkswagens. In the 60's VW decided to try and resolve these problems. The first solution was .006" valve clearance spec for all engines.(previosly 004" in many models) Since cylinder #3 had a tendency to run hotter, preignite more and burn more valves the timing for that cylinder was retarded. A special rocker arm stud kit was released to allow retrofit of early heads to accomidate the .006" valve adjustment spec. My understanding is that these changes did help make the VW engine more reliable and longer lasting. Josh Brooks ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~