Valve face is the place where valve and valve seat meet and seal. Google valve face and see what is valve face. For interference engine, the valve margin will hit the piston top, distorting the valve face and therefore fail to seal. It has nothing to do with the valve stem.
Learn some basis
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• 这个我看明白了,可能这么一磕,磕掉了seat上的一些碳渣 -triangle- ♂ (81 bytes) () 01/25/2011 postreply 13:15:54