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Sorry, I misquoted Dave. He wrote: > The parts book gives M240 as having recessed pistons while the M249 has the > same (flat top?) as the other models apart from the twin carb (which has the > domed pistons). All 1500 cc, 83mm dia. > That ties in with the various hp quoted. 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. Scott 62 343, 65 361 ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe