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Valve seats

Fig 1: Identifying Valve Seat Angles
GLL102650Courtesy of VOLVO CARS OF NORTH AMERICA.
Upper reduction angle (A)
Inlet........20°
Exhaust........15°
Matching surface angle (B) 
Inlet/exhaust........45°
Lower reduction angle (C) 
Inlet/exhaust........60°
Valve seat, width (a) 
Inlet........1.4-1.8 mm
Exhaust........1.8-2.2 mm
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