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It has nothing to do with heads on any VW other than the T4. The valve seats have a tendency to come out of the head, and wedging between the valve and the seat. The factory installation is to punch stake them into position, which doesn't provide enough friction and force to retain them in the correct position. Of a few ways to manage this, the one that AVP uses is to manufacture oversize valve seats, cool the seats, heat the head, and then use a circular staking process, IIRC. I had a '80 Vanagon that went through this problem, and found that AVP in Sacramento knew how to deal with it properly, and that they were local to me. They also did some head welding on the T4 when I screwed up and broke the lip where the valve cover seats. They also provide rebuilt engines for other VW's. For those not up on Vanagons, the early years '80-'83 were air cooled T4 engines, had reliable FI, hydraulic lifters, an oil filter, on the flat 2L engines, thus a nice fit (more or less) for T3 applications. Jeff '67 Sqbk -----Original Message----- On 27 Aug 2003 at 19:35, Hal Sullivan wrote: > Now, the issues with T4 valve *seats* has been pretty well > figured out and cured, if you can get a shop to do them *right* instead > of "how the factory says to do them". Jim requestioned us with : Please explain the 2 and what the differences are. Does any of this apply to our heads? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org