CYLINDER HEAD & VALVES
These engines are the overhead valve type with two
valves per cylinder. All turbocharged engines are built
with "STELLITE" exhaust valves, which have special
NOTE: DO NOT use an exhaust valve from a
naturally aspirated engine in a turbocharged engine.
non-stellite exhaust valves are used in naturally
VALVE ROTATORS are used on all valves to prolong
The VALVE ARRANGEMENT in the cylinder head is
intake-exhaust, intake-exhaust and so on, starting from
the front of the engine.
The exhaust VALVE FACE ANGLES are ground at 45
degrees and the intake at 30 degrees.
400 SERIES engines use valve seat inserts on both the
intake and exhaust valves.
The VALVE LEVER and SHAFT ASSEMBLY is mounted
to the cylinder head. The valve lever shaft is lubricated
from a drilled passage in the crankcase through the rear
stud hole of the cylinder head.
Valve levers and valve lever shaft are subject to frictional
wear and hammering. During engine overhaul check
these parts against "Specifications". Correct installation
of valve lever shaft is important to valve train lubrication.
The Cylinder Head Is Identified as follows:
NATURALLY ASPIRATED ENGINES have a recessed
letter "H" cast into the intake manifold side of the cylinder
head, which designates "High Swirl."
Figure 2. - "H" (High Swirl)
TURBOCHARGED ENGINES (except "B"& "C" Series)
have NO markings, which designate "Low Swirl."
Figure 3. - No Markings (Low Swirl)
TURBOCHARGED "B" & "C" SERIES ENGINES have a
recessed cross "+" cast into the side of the cylinder
head, which designates "Intermediate Swirl."
Figure 4. - "+" (Intermediate Swirl)
PRINTED IN UNITED STATES OF AMERICA