Back when I had GPASC heads, most likely from EMPI, with the oversize valves, the exhaust seat kept melting into the head. This was before GPASC realized that oversize valves were not necessary. My fix then, was to get genuine VW heads from Brazil with standard size valves. Problem solved. I don't know if they even make them anymore. But I think the real problem was the oversize valves on the exhaust because they cut out too much of the meat of the head around that valve that it could not get the proper cooling.
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