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Lead free conversion consist of replacing seat with hard material seats and replacing the guides with bronze inserts to increase the heat transfer rate through the valve stem. This is necessary due to unleaded fuels burning at a higher temperature. This example is a Fiat 130 Coupe circa 1968.

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The head is cleaned and inspected before any machining starts The old valve seat is removed The hole for the new seat is bored around a centering pilot
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The insert is fitted ...And machined flush with the chamber The insert is roughly finished with a fixed point tool
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Next the valve guides are machined... to take a guide liner. This enables the guides to be reclaimed without altering their location with in the head. The seats are finally ground to ensure accurate position and concentricity.