Intake And Exhaust Valve

WARNING: This page is about a different variant/trim than selected.

Inspect the flange of valve and valve stem, and replace the valve with a new part if damaged, worn, deformed, or if dimension "H" in the figure is outside of the specified limit.
Head edge thickness H:

Standard

Intake (A)

1.0 - 1.4 mm (0.039 - 0.055 in)

Exhaust (B)

1.3 - 1.7 mm (0.051 - 0.067 in)

Fig 1: Identifying Intake And Exhaust Head Edge Thickness
Courtesy of SUBARU OF AMERICA, INC.
Put a small amount of grinding compound on the valve seat surface, and lap the valve and valve seat surface. Replace with a new valve oil seal after lapping.
NOTE: It is possible to differentiate between the intake valve and the exhaust valve by their overall length.

Valve overall length:

Intake

104.4 mm (4.110 in)

Exhaust

104.65 mm (4.1201 in)