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From what you've added, I'd give the valve stem seals a shot, or at least a look/see. If you pull the valve cover and find that the rubber wafers (seals) at the top of the valves, sitting on the keepers, are hard, brittle, broken, or gone, get yerself 8 new ones. You have to back off on the valve adjusters to install and then readjust the valves, but not a big deal. I've seen where they've been so hard and brittle as to have broken and fallen off. If they're missing on top,look around on the top of the head and retrieve and dispose of. good luck
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