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EM-142 < SERVICE DATA AND SPECIFICATIONS (SDS) [MR FOR NISMO RS MODELS] SERVICE DATA AND SPECIFICATIONS (SDS) Cylinder Head INFOID:0000000012197322 CYLINDER HEAD Unit: mm (in) VALVE DIMENSIONS Unit: mm (in) VALVE GUIDE 346 3.46 (0.1362) 348 3.48 (0.1370) 350 3.50 (0.1378) Identification mark Thickness Items Standard Limit Head surface distortion — 0.1 (0.004) Normal cylinder head height “H” 130.9 (5.15) — PBIC0924E Valve head diameter “D” Intake 31.2 - 31.5 (1.228 - 1.240) Exhaust 25.6 - 25.9 (1.008 - 1.020) Valve length “L” Intake 107.08 (4.22) Exhaust 106.06 (4.18) Valve stem diameter “d” Intake 5.465 - 5.480 (0.2152 - 0.2157) Exhaust 5.455 - 5.470 (0.2148 - 0.2154) Valve seat angle “ α” 45 °15′ - 45°45′ Valve margin “T” Intake 1.4 (0.055) Exhaust 1.4 (0.055) SEM188A |