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>> This approach to your problem is correct if you are >using barrel shims, I don't like using the head shims >as they have a tendency to burn out and trench the >head. I would be using barrel shims not the copper head gaskets because that is what I have. I also don't care for the idea of another interface in the combustion chamber that the copper head gaskets would introduce. The combination of 0.010 and 0.040 is only because that is what I have on hand. I might run to the local VWFLAPS and see if they have a set of 0.030 shims. Then I could use shims only on the 3/4 side and get a compression ratio of 7.4 to 1 instead of the 7.25. Either way I will have to go into both side because the 1/2 side is the one I am replacing and the 3/4 is the smaller side that would need the shims. Just the way this seems to go. <G> Haven't heard a downside to using different shims on each side yet.....anyone else have a thought on this????? I have actually been doing this for the last 12,000 miles but with only a 0.010 shim on one side and nothing on the other. Later, John Jaranson '71 FI AT Fasty (Jane - Darkside Project) '66 Square (Sophy - Daily Driver) About Half a Late Square (Organ Donor) http://mywebpages.comcast.net/jaransonT3/jaransonT3/ http://mywebpages.comcast.net/jaransonT3/notavwclub/ ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org