Specifications

Combustion chamber volume

3.33–3.51 in³ (54.5–57.5 cm³)

Valve stem diameter - intake

0.2368–0.2380 in (6.015–6.044 mm)

Valve stem diameter - exhaust

0.2368–0.2380 in (6.015–6.044 mm)

Valve stem-to-guide clearance - intake

0.0008–0.0027 in (.02–.069 mm)

Valve stem-to-guide clearance - exhaust

0.0018–0.0037 in (.045–.094 mm)

Valve head diameter - intake

1.46 in (37 mm)

Valve head diameter - exhaust

1.22 in (31 mm)

Valve face runout

0.0020 in (.05 mm)

Valve face angle

3 angle

Valve seat width - intake

0.051–0.059 in (1.3–1.5 mm)

Valve seat width - exhaust

0.055–0.063 in (1.4–1.6 mm)

Valve seat runout

0.0016 in (.04 mm)

Valve seat angle

121/91/61 degrees

Valve spring free length - intake

2.020 in (51.32 mm)

Valve spring free length - exhaust

2.020 in (51.32 mm)

Valve spring perpendicularity - intake

0.118 in (3 mm)

Valve spring perpendicularity - exhaust

0.118 in (3 mm)

Valve spring compression force - intake

650 N

Valve spring compression force - exhaust

650 N

Valve spring installed height - intake

1.5748 in (40 mm)

Valve spring installed height - exhaust

1.5748 in (40 mm)

Valve spring installed force - intake

265 N

Valve spring installed force - exhaust

265 N

Roller follower ratio

2:1

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