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On 9 Mar 2001, at 22:13, Type3Guy wrote: > when I rebuilt the head in my Sprite...vintage 1968, the valve seats were completely > crapped out! I had been running no lead fuel, as had the PO. The head only had 15k > on it in its life time! The head needed to be rebuilt with bronze guides added to > avoid the same result. Though this is not definitive, I hope it helps. Also, the > only VW heads I can recall seeing without the bronze guides were a set of Okrasa dual > ports and the 25hp head. I have heard that VW went thru a period of valve stem trouble in the 1200cc era and that one of the things they tried was cast iron guides. I THINK this was only applied as a repair, and I don't think it lasted long. Since this was in the early 60s there was lots of lead in the gas at that time. Cast iron guides remain available and I have seen a few heads with them installed. They were always COMPLETELY worn out, much worse than any bronze guide that I have ever seen come out of an engine. But my sample size is small, so I don't really know if this means anything. I didn't even know that Okrasa made heads (what kind of guides DID they use?) and I don't know anything about the 25 hp heads. What kind of guides did THEY use? - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe