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On 6 Mar 2001, at 16:28, Jedediah Millheiser wrote: > i assume by slip-ins you mean cast pistons. No, he's referring to the cylinder sets made with an oversize ID, but the stock OD so they will just "slip in" to a stock case without machining the case holes oversize. This is a very common cheap way to increase the displacement of the VW engine. The problem is that when they increase the ID and hold the OD constant the wall gets thin and the rings won't seal, and the parts don't last. Engines built this way rather quickly develop less than stock power and have much less than stock lifetimes. The alternative are "machine in" P/C sets which require that you send the case out to have the sockets for the cylinders bored out to fit the larger cylinders, which are larger on the OD as well as the ID. This is necessary to get stock reliability with larger displacement engines. ALL the questions you've been asking are carefully answered in this very good book. If you have any thoughts of doing any HP engine work you need a copy. How to Hotrod Volkswagen Engines by Bill Fisher published by H. P. Books, Tucson, AZ, 1970 ISBN 0-912656-03-4 (excellent book, well written and researched) - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Pitch in! Send your pledge of support! mailto:support@vwtype3.org