Cylinder Block - Rebuild Section V - Specifications - Group 18 Page V-28 M11 Component or Assembly (Procedure) Ref.No./Steps Metric U.S. Valve Guide O.D. (Seal Area) 14.25 mm MIN 0.561 in 14.37 mm MAX 0.566 in Valve Guide O.D. (Base) 16.513 mm MIN 0.6501 in 16.526 mm MAX 0.6506 in Valve Seat Area Width 1 1.63 mm MIN 0.064 in 2.69 mm MAX 0.106 in Valve Seat to Valve Guide Concentricity 0.05 mm MAX 0.002 in (Per 360 Degrees) Valve Recess in Cylinder Head 1 0.76 mm MIN 0.030 in 1.17 mm MAX 0.046 in Valve Head Thickness (at. O.D.) 3.15 mm MIN 0.124 in 3.62 mm MAX 0.143 in Valve Insert Bore Depth (Standard Insert) 9.40 mm MIN 0.370 in 9.50 mm MAX 0.374 in