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Peter and others, I read in the newsgroup (rec.autos.makers.vw.aircooled) that very early VWs used iron heads. Here's a direct quote from the FAQs from the NG: 5.) Do I need to use a lead additive/lead substitute in my VW? Volkswagen stated that all of their heads from about 1966 on have been made with hardened valves, seats, and valve guides. Therefore lead additive/substitute is not needed. If your heads have been rebuilt, then the machinist probably used the good stuff. Silicon-bronze valve guides are the good ones if that helps. Should stainless-steel valves be used? Hmm, I don't know. I've *heard* that they are 'softer' and will require more valve adjustments but I will neither confirm or deny this. My guess would be to stay stock or talk with a couple of professional engine builders, preferably the ones who build race engines as they tend to know more about the various components and materials. Toby Erkson, air_cooled_nut@pobox.com '72 VW Squareback 1.6L bored and stroked to 2.0L '75 Porsche 914 1.8L Portland, Oregon, http://www.geocities.com/MotorCity/8501/