*VLO has momo, especially since it's broken psychological 100, also the up-volume is amazing, especially on a week when the offices are far from filled on Wall Street...
As far as producing an overbought pullback, it'll likely get pullbacks during each day if you plan to daytrade it, today's spike was a pretty healthy pullback, as far as swing-trading goes though, it would probably pause or maybe throw up an evening star or a couple of doji in a row as indecision would take over at any top I would think...