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On 20 Mar 2003 at 20:01, John Jaranson wrote: > In order to get uniform compression I can obviously rework the 3/4 head to > open the combustion chamber up, but I can also just shim one side different > than the other. A 0.040 shim on the 3/4 side and a 0.010 shim on the 1/2 > side gets my compression ratio for each cylinder within 1% of each other at > 7.25 to 1. There might be a small problem with this. The gap above the outer edge of the piston at TDC is called the squish zone and it is important that this be rather tight (~.040".) If one side is much tighter than the other this would make a difference, so a lot depends on what the difference is in the combustion chambers that makes this one larger. You could also flycut this new head to try to match it to the old one. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org