As Shawn mentions, the "old style" oil can is the kind with a flexible spout and perhaps with a lever that you actuate with your thumb. I got one at Harbor Freight for a couple of bucks several years ago. The valves are not under the spark plugs, they're off to the port side for your traditional installations (starboard side for my v-drive setup), so to get whatever you're spraying in there to the valves you need to spray sideways.
I think of Seafoam as more of a solvent than a lubricant, at least in the pour bottle - but maybe the stuff in the spray can is slipperier?
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