If it recommends adjustment then no, the whole point of hydraulic lifters is they automatically compensate for valve wear. Adjusting the clearance is very easy with this setup though. You'd be hard pressed to find a more accessible valve cover and all you need is a set of feeler gauges (hardware or autoparts store would have then) a wrench and a flat head screw driver. This is smooth sailing compared to something with buckets and shims or a Ducati (shudder). If you feel up to it I can walk you through it, though we'd need the valve clearance numbers first.