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On 5 Jul 2001, at 9:31, Scott Taylor wrote: > I also found this in my parts book. It lists the standard flat top > pistons (311-107-101-AA) for engines 225340 through 1100000 with > option M249, as opposed to 311-107-101-Q recessed pistons or > 341-107-101-A domed pistons (interesting that the domed pistons get a > Type 34 part number). So that must be it: M240 is the code for > recessed pistons, but on the 1500S engines with N serial numbers the > compression was lowered not through use of recessed pistons but rather > the standard 1500N flat top pistons, so no M240. When I look up pistons in the 73 paper PL I find most of what you find. There are both M240 and M249, and the R engine is mentioned as well as recessed pistons. There is no mention of domed pistons or an N engine. When I look these up in the microfilm I find only the M240 and no mention of N or R or domed pistons. I think you've got it accurately figured out, but I still have a problem with calling anything other than a high compression engine with domed pistons a 1500S. So it looks like the facts got edited out slowly over the years. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/