90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
Valve Seat: Specifications
Refacing Dimension [1]
Minimum dimensions
Intake valve ................................................................................................................................................................................................... 36.0 mm
Exhaust valve ................................................................................................................................................................................................ 36.3 mm
Intake Valve Seat
Seat Diameter Outer Edge ................................................................................................................................................................... 31.2 mm (1.229 in)
Seat Angle .................................................................................................................................................................................................................... 45°
Seat Width .......................................................................................................................................................... 1.5 mm to 1.8 mm (0.059 in to 0.071 in)
Lower Correcting Angle ............................................................................................................................................................................................... 75°
Upper Correcting Angle ............................................................................................................................................................................................... 30°
Exhaust Valve Seat
Seat Diameter Outer Edge ................................................................................................................................................................... 27.6 mm (1.087 in)
Seat Angle .................................................................................................................................................................................................................... 45°
Seat Width .................................................................................................................................................................... Approximately 1.8 mm (0.071 in)
Upper Correcting Angle ............................................................................................................................................................................................... 30°
[1]
Measure distance between center of valve stem end and upper edge of cylinder head.