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30 Jan 2014 The clearance between the valve stem and the guide in the head is a critical dimension. Too tight and the valve can stick in the guide when the 9 Jul 2013 22 Sep 2014 I want to leave enough clearance between the stem and the guide so that when hot, the stem will not seize in the guide. How much clearance After just so long, this can cause the head to break off the valve stem, damaging piston, cylinder head and cylinder block. A general rule of thumb is that intake guides need guide-to-stem clearance of .001? to .003? and exhaust guides need from .002? to .004? clearance. The type of engine will make a difference. The following lists standard valve guide clearances. Excessive wear of the valve stem faces. • Worn rocker clearance between valve stem and inner guide The clearance between the inner diameter of the valve guide and the outer diameter of the poppet valve stem is critical for the proper performance of an engine. They found that by reaming all the valve guides in a head to one standard size (typically 0.008 in.31 Oct 2014 If a valve replacement is required, the clearance between valve stem and inner guide diameter must not exceed the specified values. If the clearance is too large Excessive valve stem and guide wear can occur on inlet and exhaust valves. Too much stem-to-guide clearance can lead to the bell-mouthing of the guide. it is cold, or carbon packing between the stem and guide when the engine is hot.