Valve Specifications

VALVE SPECIFICATIONS

Application

In. (mm)

Intake

Head Diameter

⁽¹⁾ 1.59 (40.3)

Face Angle

45°

Seat Angle

⁽²⁾ 45°

Seat Width

.047-.063 (1.19-1.60)

Stem Diameter

.310 Min. (7.88)

Stem Clearance

⁽³⁾ .0009-.0022 (.023-.056)

Valve Lift

n/a

Exhaust

Head Diameter

⁽¹⁾ 1.34 (34)

Face Angle

45°

Seat Angle

⁽²⁾ 45°

Seat Width

.047-.063 (1.19-1.60)

Stem Diameter

.309 Min. (7.85)

Stem Clearance

⁽³⁾ .0013-.0031 (.034-.079)

Valve Lift

n/a

⁽¹⁾	Values are I-Mark and P'UP models. Impulse intake valve head diameter is 1.67" (42.4 mm) and 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 stem clearance is .008" (.20 mm) for intake and .009" (.25 mm) for exhaust.