Valve Specifications

VALVE SPECIFICATIONS

Application

In. (mm)

Intake

Head Diameter

⁽¹⁾ 1.59 (40.4)

Face Angle

45°

Seat Angle

⁽²⁾ 45°

Seat Width

⁽³⁾ .048-.063 (1.2-1.6)

Stem Diameter

⁽⁴⁾ .315 (8.0)

Stem Clearance

⁽⁵⁾ .0009-.0022 (.023-.056)

Valve Lift

n/a

Exhaust

Head Diameter

⁽¹⁾ 1.34 (34)

Face Angle

45°

Seat Angle

⁽²⁾ 45°

Seat Width

⁽³⁾ .048-.063 (1.2-1.6)

Stem Diameter

⁽⁴⁾ .315 (8.0)

Stem Clearance

⁽⁵⁾ .0015-.0031 (.034-.078)

Valve Lift

n/a

⁽¹⁾	Impulse intake valve head diameter is 1.67" (42.4 mm), exhaust valve head diameter is 1.34" (34.0 mm).

⁽²⁾	Correction angles for intake and exhaust valve seats are 15° and 75°.

⁽³⁾	Maximum valve seat width .078" (2.0 mm).

⁽⁴⁾	Maximum valve stem clearance is .310" (7.87 mm) for intake and .309 (7.85 mm) for exhaust.

⁽⁵⁾	Maximum valve stem clearance is .008" (.20 mm) for intake and .0097 (.25 mm) for exhaust.