Valve Lifter

Check the valve lifter visually.
Measure the outer diameter of valve lifter.
Outer diameter:

32.959 - 32.975 mm (1.2976 - 1.2982 in)

Fig 1: Identifying Outer Diameter Of Valve Lifter
Courtesy of SUBARU OF AMERICA, INC.
Measure the inner diameter of valve lifter hole of cylinder head.
Inner diameter:

32.994 - 33.016 mm (1.2990 - 1.2998 in)

Fig 2: Measuring Inner Diameter Of Valve Lifter Hole Of Cylinder Head
Courtesy of SUBARU OF AMERICA, INC.

NOTE: If difference between outer diameter of valve lifter and inner diameter of valve lifter hole is out of the standard or offset wearing is emitted, replace the cylinder head.

Standard:

0.019 - 0.057 mm (0.0007 - 0.0022 in)