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jman093 (Jesse) advertised some valve stem seals with some random parts on here last year. I thought the seals looked a lot like vert top pin cups so I bought a few. I haven't tried to put these on my car, but they do fit over the top pin nicely. The seals are shorter than the plastic cups, but it might not matter because the pins will go all the way through. Can someone verify if this matters? Also, I'm not sure how they attach to the windshield header so I'm not sure if the stock fastener will work. Can someone post a pic of the stock fastener and about how far up on the shaft it normally goes? Jesse, do you remember what application did the seals come from? Here are some pics of an original plastic one beside the slightly smaller valve stem seal. You can see on the last pic how the top pin goes all the way through the seal, but it might not matter.

There is another way to look for a cylinder that is leaking into the coolant system, one will have to sacrifice a cylinder compression tester, one removes the braided hose end from the gauge, then installs a male barb quick release air fitting into the open end & secures it, now assuming that you have an air compressor one screws the spark plug end into each cylinder & pumps in 100lbs pressure. Remove the rad cap, if there is a leaking head gasket to the coolant system this will find it. This is also a good way to find leaking valves that are not seating, with the piston at TDC compression all valves should be securely closed, if there is a valve that is not you'll here the air (whoosh) at either the tailpipe or the throttle body.

Good looking car man. That Blue looks so understated, but elegant on this platform. First time seeing a CSC in blue. And it has my favorite non LS engine to boot.

Good to hear from you Sean! It's good to see that beautiful vert again!