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> area thicker by going to a 3/4" SP thread should be a big help and > is something that I've heard of several suppliers doing, but I've never > seen one. If you also make the valves smaller that helps a lot also, > but also cuts down on the engine's breathing. Considering that > most of the sales for this kind of head are to the high performance > crowd, this seems like a counterproductive way to go. If these are factory heads for the Mexican Beetle, it seems the sensible way to go! Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org