Having done a valve adjustment on a K24, it's not hard. Wouldn't hurt to check the valve lash anyway. Only thing that might not be commonly known is the service manual calls for two dabs of RTV at the front of the engine where the "points" on the valve cover meet the block. You'll probably see the old dabs from the factory. Scrape the old stuff of gently, replace the gaskets, put two fresh dabs on, and slip the cover back on. The "doughnuts" around the spark plug wells might catch on the sleeves, so take it easy. Actually, at 110K you're due for spark plugs if you haven't already done them. Good time to do it since the coil packs have to come off anyway.