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> I wonder if another possibility is that what you're feeling is a slight > pinging. Have you tried higher octane gas? Upping the displacement from 1500 to > 1600 would also up the compression ratio a bit, and this could be blindsiding > you. > Maybe if it was previously a 1500 single carb, but the 1500S twin carb had a much higher CR than the 1600. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~