The lessening of inclusions and porosity together with nearly full density, minimal alloying content, {TAIL ~ carburizing} and heat treating results in improving the mechanical properties of {HEAD ~ our powdered metal valve lifter} to the extent of withstanding the extremely high contact stresses developed between the valve lifter face and its respective cam face located on the camshaft proper 
The lessening of inclusions and porosity together with nearly full density , minimal alloying content , { TAIL ~ carburizing } and heat treating results in improving the mechanical properties of { HEAD ~ our powdered metal valve lifter } to the extent of withstanding the extremely high contact stresses developed between the valve lifter face and its respective cam face located on the camshaft proper
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