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> The welded up holes are for the dual balance pipe, I think its a 73 only > part. 1971 on twin carb had provision for the dual balance pipes (though in some cases they linked through elbows and tee to a single one crossing the crankcase). The pipes are vacuum take-off, for the distributor (dual vac?). I'm not sure why both sides have them; the two manifolds should be different, with only the left one having the other pipe. Dave. UK VW Type 3&4 Club http://www.hallvw.clara.net/ ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe