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Valve lash is the end of the rocker arm and the valve stem clearance between. When the engine is running, due to the thermal expansion and contraction, if there is no gap between the rocker arm and the valve stem, rocker arm swells, the top valve open, the impact of engine power and economy. Engine valve clearance will be different, usually when the car is cold, the intake valve 0.08-0.10MM, clearance exhaust valves 0.10-0.12MM Car Diagnostic Tool
Valve clearances are set by either tappet screws in the lifters or on a lot of small engines, clearances must be set by either cutting out valve seats with a special cutter tool (to DECREASE clearances) or grinding the end of the valve (to INCREASE clearances) and generally are from .008-.010 on intake valves and .010-.012 on exhaust valves. Check engine specs to insure proper clearances.