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Remote Name: 192.168.1.2
Date: 08 Feb 2005
Seat width is generally accepted as that width of the conical ring that touches the valve and the seat providing the gas tight seal. In competition engines this is usually kept to a minimum to increase the gas flow whereas in production engines it is wider so as to maintain a seal over a longer period. If you are lapping the seats it will be the grey (rather than shiny) area formed by the grinding paste. Thus both values would be correct as fit for their respective purposes.