Subaru Impreza 2002 Service Manual page 28

6. Cylinder Head
D
The cylinder head is made of aluminium die casting.
D
Each combustion chamber in the cylinder head is a compact, pentroof design. The spark plug
is located at the center of the combustion chamber, which contributes to creation of a wide "squish
area" for increased combustion efficiency.
D
The two intake and two exhaust valves are arranged on opposite sides for a cross-flow feature.
D
The cylinder head gasket is a metallic gasket consisting of three layers of the stainless steel
sheets. It is highly resistant to heat and maintains high level of sealing performance for a long peri-
od.
B: STi MODEL
(1) Intake valve (hollow type)
(2) Intake port
(3) Squish area
(4) Combustion chamber
CYLINDER HEAD
(5) Exhaust port
(6) Exhaust valve (Sodium-filled)
(7) Spark plug
ME-3
Mechanical
NF0626