6-50
1968
PONTIAC
SERVICE
MANUAL
NOTE;
If left head is being removed, it
will
be
necessary
to
raise
head off dowel pins, move it
forward
and maneuver the head in order to
clear
the power steering and power brake equipment if
car
is so equipped
c
NOTE:
On
Firebird
models, when removing the
right
head on V-8's equipped with A/C, it is nec-
essary
to remove the right insulator to frame bolt
and
raise
engine approximately 2" to gain access
to the right
rear
valve cover bolt and right
rear
cylinder
head bolt.
Care
must be taken to avoid
the fan contacting the fan shroud.
9
0
Remove cylinder head gasket.
REPLACE
NOTE:
Right and left cylinder heads are the
same. New heads are complete with
rocker
arm
studs
(exc. heads with
screwed
in studs) and all
plugs.
When
installing new head, transfer all serviceable
parts to new head, using new seals on intake and
exhaust manifold valve stems, and new exhaust
manifold gasket. Install new intake manifold gasket
plastic retainers. 6lamp straight
edge
into position
as shown in Fig. 6-86 and check rocker arm position
with valve train
gauge
J 8928.
1. Remove straight
edge
from cylinder head and
thoroughly clean gasket surfaces of head and block.
Place
new gasket on block, and replace cylinder
head.
NOTE:
On
Firebird
models, when
replacing
right
cylinder
head on V-8 equipped with A/C, it
will
be
necessary
to insert the right
rear
bolt into the
head
before
replacing
the head on the block.
STRAIGHT
EDGE
"
END OF
GAUGE
PROJECTS-
STEP
DOES
NOT
PROJECT
BEYOND
EDGE
OF
STRAIGHT
EDGE
Fig.
6-86 Checking Stud
Height
2. Start all bolts.
NOTE:
Bolts
are three different lengths. When
inserted
in proper holes all bolts
will
project an
equal
distance from the head. Do not use sealer
of
any kind on the threads.
3.
Tighten
bolts
evenly to 95 lb. ft. torque.
4. Install push rods in same location from which
they were removed and with the same end up against
rocker
arm.
5. Reposition rocker arms and tighten rocker arm
ball
retaining nuts to 20 lb. ft. torque.
6. Replace rocker arm cover and tighten screws.
7. Replace push rod cover and tighten screws.
8. Replace battery ground strap and
engine
ground
strap on
left
hand or
engine
ground strap and auto-
matic transmission oil level indicator
tube
bracket
on right head. Also replace the
engine
oil level
indicator on right side.
9. Replace intake manifold using new gaskets.
10. Install exhaust-pip e -to
-
manifold attaching nuts.
11. On
Firebird
models, replace right side insula-
tor-to-bracket bolt on A/C equipped V-8
f
s.
ROCKER
ARM STUDS-REMOVE AND
REPLACE
PRESSED
IN
STUDS
NOTE:
ONLY
.005"
OVERSIZE
STUDS
ARE
AVAILABLE.
THIS
STUD
IS TO BE
USED
IF
STUD
HAS
BECOME
LOOSE,
BROKEN
OR BE-
CAUSE
OF
FAULTY
THREADS.
The
procedures shown are for replacement without
removal of cylinder head. If it is found necessary to
remove the cylinder head for another reason, this
procedure can be used with slight modification.
1. Disconnect battery and drain radiator.
2. Remove rocker arm cover.
3.
Pack oily rags around stud and
engine
openings.
4. With rocker arm removed, file two
slots
3/32"
to 1/8"
deep
on
opposite
sides of rocker arm stud
(Fig.
6-87). Top of
slots
should be 1/4" to 3/8"
below
thread travel.
5. Place washer at
bottom
of rocker arm stud.
6. Position rocker arm stud remover J
8934
on
rocker
arm stud and tighten screws securely with
5/32" alien wrench.
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