[rhandwor]

I think the valve stem seals are going bad. Go to an auto machine shop and buy a set of umbrella seals. You can use air or put a piece of rope in the cylinder move by hand until it is holding the valves closed. You can do one cylinder at a time. You just need seals a valve spring compressor and valve cover gaskets. I would allow a days time if you haven't done it before. Have a magnet handy if you drop a keeper. I've dropped a 1/4 inch socket into a triton engine and fished it out with a small magnet. Just be very careful and make sure all parts are installed. Do over concrete in case you drop something.