Dimension & Clearance Specifications - Valves

Valve Guide Bore Inside Diameter:
Standard 11.000-11.027 mm (0.4331-0.4341 inch)
Oversize 11.050-11.077 mm (0.4350-0.4361 inch)
Valve Guide Bushing:
Inside Diameter 6.010-6.030 mm (0.2366-0.2374 inch)
Valve Guide Protrusion 12.7-13.1 mm (0.500-0.516 inch)
Valve Head Angles for Refinishing:
Area Above Seat Contact Surface 30°
Area Below Seat Contact Surface 75°
Seat Contact Surface 45°
Valve Head Thickness:
Standard 0.8-1.2 mm (0.031-0.047 inch)
Minimum Limit 0.5 mm (0.0200 inch)
Valve Overall Length:
Intake:
Standard 87.45 mm (3.4429 inch)
Minimum 86.95 mm (3.4232 inch)
Exhaust:
Standard 87.84 mm (3.4583 inch)
Minimum 87.35 mm (3.4390 inch)
Valve Seating Contact Width 1.20-1.60 mm (0.0470-0.0630 inch)
Valve Spring Free Length 42.4 mm (1.669 inch)
Valve Spring Preload:
Standard 16.9 kg at 31.7 mm (37.3 lbs. at 1.248 inch)
Valve Spring Squareness (Maximum) 2.0 mm (0.079 inch)
Valve Stem Outside Diameter:
Intake Valves 5.970-5.985 mm (0.2350-0.2356 inch)
Exhaust Valves 5.965-5.980 mm (0.2348-0.2354 inch)
Valve Stem-to-Valve Guide (Oil) Clearance:
Intake Valves:
Standard 0.025-0.060 mm (0.0010-0.0024 inch)
Minimum 0.08 mm (0.0031 inch)
Exhaust Valves:
Standard 0.030-0.065 mm (0.0012-0.0026 inch)
Minimum 0.10 mm (0.0039 inch)