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Cylinder Head And Valve Train

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
CYLINDER HEAD AND VALVE TRAIN

Item Specification
Combustion Chamber Volume (cc) 50.1-47.1
Valve Guide Bore Diameter  
Intake and Exhaust 7.017-7.042 mm (0.2762-0.2772 in)
Valve Seats 
Width - Intake and Exhaust 2.0-2.5 mm (0.078-0.098 in)
Angle 44.5 Degrees
Runout (T.I.R.) 0.035 mm (0.0013 in)
Gasket Surface Flatness 0.08 mm (0.003 in)
over 152.0 mm (6.00 in)
Valve Stem to Guide Clearance 
Intake 0.026-0.071 mm (0.001-0.0027 in)
Exhaust 0.038-0.083 mm (0.0015-0.0032 in)
Valve Head Diameter 
Intake 40.0 mm (1.57 in)
Exhaust 33.0 mm (1.30 in)
Valve Face Runout Limit 0.05 mm (0.002 in)
Valve Face Angle 45.62 Degrees
Valve Stem 
Diameter (Std.)  
Intake 6.971-6.991 mm (0.2744-0.2752 in)
Exhaust 6.959-6.979 mm (0.2739-0.2747 in)
Oversize  
Intake 8.340-8.320 mm (0.3283-0.3276 in)
Exhaust 8.328-8.308 mm (0.3279-0.3271 in)
Oversize  
Intake 8.720-8.700 mm (0.3433-0.3425 in)
Exhaust 8.708-8.688 mm (0.3428-0.3420 in)
Valve Springs 
Valve Open to Maximum Lift 912 N @ 29.74 mm (1.17 in)
Valve Closed 304 N @ 40.52 mm (1.60 in)
Free Length (Approximate) 46.4 mm (1.89 in)
Installed Spring Height 44.17-41.98 mm (1.736-1.650 in)
Service Limit 10% Force Loss @ Specified Height
Rocker Arm Ratio 1.61
Valve Tappet, Hydraulic 
Diameter (Std.) 22.206 mm (0.874 in)
Clearance to Bore 0.018-0.069 mm (0.0007-0.0027 in)
Service Limit 0.127 mm (0.005 in)
Hydraulic Leak-Down Rate a
Collapsed Tappet Gap (Nominal)
Intake 2.23-4.77 mm (0.088-0.189 in)
Exhaust 2.23-4.77 mm (0.088-0.189 in)
Distributor Shaft Bearing Bore Diameter 22.268-22.230 mm (0.08767-0.8752 in)
Tappet Bore Diameter 22.224-22.275 mm (0.875-0.877 in)
Camshaft Bore Inside Diameter 
No. 1 54.688-54.713 mm (2.1531-2.1541 in)
No. 2 54.188-54.213 mm (2.1334-2.1344 in)
No. 3 54.188-54.213 mm (2.1334-2.1344 in)
No. 4 54.688-54.713 mm (2.1531-2.1541 in)

a 20-200 seconds to leak-down 3.18 (0.125 in) with 225 Newtons (50 pounds) load and tappet filled with leak-down fluid.