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<x-charset iso-8859-1>AVP oversizes the seat, chills it, and installs it in an undersized head opening. Staking only has a local effect, and they tried it and changed. Maybe they do a all-around staking, too, I forget. My '80 Vanagon dropped it's valve seat. Theirs don't drop. They specialize in T4 engines. http://www.avp-worldwide.com/ Jeff '67 Sqbk -----Original Message-----Jim asked--- > If the heads were done by a competent rebuilder the valve seats should never > come loose, even on a big motor... this was a T4 problem and even then there was > a good fix. What's the good fix? A type 4 customer of mine had this happen a couple of years ago in his 72 1700. ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ </x-charset>