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On the Fuel injected ones(68-70) the vent went from the oil breather stand to the air filter, the aux air vents to the air filter also. On the later T-3(71-73) they also vented the valve covers and or the heads to the air filter. some of the models was connected between the bottom(dipstick filler Pipe) and to the oil breather stand then to the air filter, many different years, all to have a negative pressure on the engine..All the earlier engines had a setup for keeping negative pressure on the engine, they all went to the air filter. Just like the T-1's(60-68)vented to the air filter with a mast hanging down in the slip stream with a negative rake(Rubber tip with a slit in it facing aft) on it for help with the vacuum at speed..I haven't explained it very well but it's true.. Phil __________________________________ Do you Yahoo!? Win a $20,000 Career Makeover at Yahoo! HotJobs http://hotjobs.sweepstakes.yahoo.com/careermakeover ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org