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HYDRAULIC TAPPETS DESCRIPTION SPECIFICATION Metric Standard Body Diameter 21.387 - 21.405 mm 0.8420 - 0.8427 in. Clearance (To Bore) 0.020 - 0.063 mm 0.0007 - 0.0024 in. Dry Lash 3.0 mm (at the valve) 0.1181 in. VALVES DESCRIPTION SPECIFICATION Face Angle 45.0° - 45.5° Head Diameter Intake 50.67 - 50.93 mm (1.99 - 2.00 in.) Exhaust 39.27 - 39.53 mm (1.54 - 1.55 in.) Length (Overall) Intake 123.38 - 123.76 mm (4.857 - 4.872 in.) Exhaust 120.475 - 120.855 mm (4.743 - 4.758 in.) Stem Diameter Intake 7.935 - 7.953 mm (0.312 - 0.313 in.) Exhaust 7.932 - 7.950 mm (0.312 - 0.313 in.) Stem - to - Guide Clearance Intake 0.022 - 0.065 mm (0.0008 - 0.0025 in.) Exhaust 0.025 - 0.065 mm (0.0009 - 0.0025 in.) Valve Lift ( @ Zero Lash) Intake 12.0 mm (0.472 in.) Exhaust 11.70 mm (0.460 in.) VALVE SPRING DESCRIPTION SPECIFICATION Spring Force (Valve Closed) Intake and Exhaust 435.0 N +/- 22.0 N @ 45 mm Spring Force (Valve Open) 1077.0 N +/- 48.0 N @ 32.6 mm. Intake and Exhaust ( 242.0 lbs. +/- 11 lbs. @ 1.283 in. ) Free Length (approx) 55.6 mm (2.189 in.) 9 - 2312 ENGINE - 5.7L SERVICE INFORMATION LX |