I'm trying to source a small OD "rubber" umbrella style of valve stem seal that slips over a 3/8" diameter valve stem and just floats on the stem rather than being fixed to the guide boss. The issue is that I have valve springs with .770" ID so they need to be a smaller OD than the ones I've been able to locate, so that there will be no interference with the springs. These heads are on an assembled engine and have not been machined to accept the aftermarket pressed on types of seal. I'd like to get a part number, manufacturer or supplier that can supply these, or if anyone has some I can buy?
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