valve refacing

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valve grinding compound — An abrasive compound used for refacing valve seats. The suction cup is placed on the valve head and the valve is pressed into the seat; turning the handle between one s hands will grind the valve into its seat; always use with grinding paste. Not … Dictionary of automotive terms
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reface — A general term for reconditioning of the interface between valves and their seats in the cylinder head; depending on valve seat condition, refacing may involve lapping, grinding, or cutting … Dictionary of automotive terms

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