The reason I asked about the right bank tick is the poor oiling to that side. If you don't already have one - recommend installing an oil pump booster kit, cheap and easy to install.
If it wasn't doing it before and you just ran Seafoam down the carb, I'd suspect you just knocked a chunk of carbon loose and the top of a piston is trying to pulverize it. If so, it'll work itself out eventually. No big deal.
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