Subaru 2002 Impreza Service Manual page 164

I
Mechanical
CYLINDER HEAD
6. Cylinder Head
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The cylinder head is made of aluminium die casting.
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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.
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The two intake and two exhaust valves are arranged on opposite sides for a cross-flow feature.
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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.
(1) Intake valve
(2) Intake port
(3) Squish area
(4) Combustion chamber
(5) Exhaust port
(6) Exhaust valve
(7) Spark plug
NF0371
M E-8