My oil burning pig. Pics too!

Mike - Thanks for the picture of your seals. I want to say I misspoke in my last post. I was thinking you were using Perfect Circle type seals which are made of Teflon (not Viton as I incorrectly said above). It's the Teflon seals which I believe have difficulty with excessive valve stem clearance since it is a relatively hard and inflexible material.

I see yours are indeed made of Viton which I understand has more flexibility. So, I don't really know that it could not handle guides with a certain amount of wear/excessive clearance.