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On 4 Mar 2005 at 12:46, Toby Erkson wrote: > So what's the theory? No air going INTO the engine via the stock method > but air going OUT via the stock method. What problems would this > cause? I believe I have some vented, stock-style valve covers (or > easily make them)...I could put those on and vent them to the stock air > filter housing. À? With no means of ingress, there's the possibility of building up a bit more vacuum in the case than you'd ideally want. I suspect that the only problems that this might cause would be that air would tend to be sucked in somewhere, and that somewhere would likely be around one end of the crank or the other. The main seal really won't seal much against pressure in that direction. Air which got sucked in there might bring dirt in with it, but this isn't likely to be any worse than the majority of these engines which no longer have any hoses attached to their head breather ports. Many replacement heads came with pads in the casting which could be used to install the breather ports. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~