Woking on my valve cover gasket etc, and the tube seals are giving me trouble. The seals themselves broke apart when I removed the valve cover, sending little bits of plastic into the valve train. So I've been fishing pieces out. I was able to chisel out the seals (seal puller wouldn't get em to budge) and when I went to reinstall, the new ones wouldn't fit... like not even close. So I'm wondering if the seals themselves have a metal ring inside them. If so, the rings have fused themselves to the valve cover. I've been trying to not damage the metal in there but if it's still seals, then I'll beat a little harder. They won't budge with a 4lb hammer and a flat head screwdriver (yet).