Cylinder Head and Valve Train
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Specification |
|---|---|
| Combustion chamber volume | 3.33 -3.51 in3 (54.5 -57.5 cm3 ) |
| Valve stem diameter - intake | 0.2352 -0.2360 in (5.975 -5.995 mm) |
| Valve stem diameter - exhaust | 0.2343 -0.2350 in (5.95 -5.97 mm) |
| Valve stem-to-guide clearance - intake | 0.0007 -0.0027 in (.019 -.069 mm) |
| Valve stem-to-guide clearance - exhaust | 0.0017 -0.0037 in (.044 -.094 mm) |
| Valve head diameter - intake | 1.51 in (38.3 mm) |
| Valve head diameter - exhaust | 1.27 in (32.2 mm) |
| Valve face runout | 0.0020 in (.05 mm) |
| Valve face angle | 3 angle intake / 2 angle exhaust |
| Valve seat width - intake | 0.047 -0.055 in (1.2 -1.4 mm) |
| Valve seat width - exhaust | 0.055 -0.063 in (1.4 -1.6 mm) |
| Valve seat roundness | 0.0098 in (.25 mm) |
| Valve seat to guide runout | 0.0016 in (0.04 mm) at bottom of guide |
| Valve seat angle (degrees) - Intake | 120/90/54 degrees |
| Valve seat angle (degrees) - Exhaust | 120/100/60 degrees |
| Valve spring free length - intake | 2.34 in (59.38 mm) |
| Valve spring free length - exhaust | 2.34 in (59.38 mm) |
| Valve spring perpendicularity - intake | 0.071 in (1.8 mm) |
| Valve spring perpendicularity - exhaust | 0.071 in (1.8 mm) |
| Valve spring compression force - intake | 826 N |
| Valve spring compression force - exhaust | 826 N |
| Valve spring installed height - intake | 1.8091 in (45.95 mm) |
| Valve spring installed height - exhaust | 1.8091 in (45.95 mm) |
| Valve spring installed force - intake | 354 N |
| Valve spring installed force - exhaust | 354 N |
| Roller follower ratio - intake (non switching) | 2.012:1 |
| Roller follower ratio - intake (switching) | 2.012:1 |
| Roller follower ratio - exhaust (non switching) | 2.001:1 |
| Roller follower ratio - exhaust (switching) | 2.001:1 |
| Cylinder head gasket surface flatness | 0.025 mm (0.001 in) in any 25 mm (1 in) x 25 mm (1 in) area; 0.050 mm (0.002 in) in any 150 mm (6 in) x 150 mm (6 in) area; 0.1 mm (0.004 in) overall |