Subaru 2002 IMPREZA Service Manual page 206

MECHANICAL
4. CYLINDER HEAD AND VALVE ASSEMBLY
(1) Exhaust valve
(2) Intake valve
(3) Valve guide
(4) Valve spring seat
GENERAL DESCRIPTION
(5) Intake valve oil seal
(6) Valve spring
(7) Retainer
(8) Retainer key
ME-10
(9) Exhaust valve oil seal
B2M1955D