S8 Quattro Sedan V8-4.2L (AYS) (2002)
Valve Seat: Specifications
Minimum dimensions
Outer Intake Valve ........................................................................................................................................................................... 34.0 mm (1.338 inch)
Center Intake Valve ......................................................................................................................................................................... 33.7 mm (1.326 inch)
Exhaust Valve .................................................................................................................................................................................. 34.4 mm (1.354 inch)
The measured distance minus the minimum dimension equals the maximum permissible refacing dimension.