Pontiac FIREBIRD 1972 Service Manual page 580

6-68 1972 PONTIAC SERVICE MANUAL
8. Remove cylinder head bolts (dowel pins will hold
head in place) and remove head with exhaust mani-
fold attached, using lifting hooks J 4266. (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).
CAUTION: Extreme care should be taken when
handling or storing cylinder heads as the rocker
ann studs are hardened and may crack if
struck.
10. Replace intake manifold using new gaskets.
1 1. Install exhaust-pipe-to-manifold attaching nuts.
12. Refill cooling system.
ROCKER ARM STUDS
PRESSED IN STUDS
REMOVE AND REPLACE
9. Remove cylinder head gasket.
REPLACE
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 valve
stems, and new exhaust manifold gasket. Install new in-
take manifold gasket plastic retainers.
Thoroughly clean gasket surfaces of head and block.
Place new gasket on block, and replace cylinder head.
Start all bolts. On 307 engines, the threads of cylinder
head bolts should be coated with a sealing compound.
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, except 307 engine.
Tighten bolts evenly to 95 lb. ft. on all but 307 engines
and to 65 lb. ft. on the 307.
Install push rods in same location from which they
were removed and with the same end up against
rocker arm.
Reposition rocker arms and tighten rocker arm ball
retaining nuts to 20 lb. ft.
On 307 engines, adjust valve mechanism as described
under PUSH ROD OR VALVE LIFTER
-
RE-
PLACE.
Replace rocker arm cover and tighten screws.
Replace push rod cover (all except 307 engine) and
tighten screws.
Replace battery ground strap and engine ground
strap or engine ground strap and automatic transmis-
sion oil level indicator tube bracket Also replace the
engine oil level indicator.
Only .005" oversize studs are available. This stud is to be
used if old stud has become loose, broken or because of
faulty threads.
The procedures shown are for rkplacement without re-
moval 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. Remove rocker arm cover.
2. Pack oily rags around stud and engine openings.
3. All except 307 engine:
With rocker arm removed, file two slots 3/32" to
1/8" deep on opposite sides of rocker arm stud
(Fig. 6- 1 1 1).
Top of slots should be 1/4" to 3/8" below thread
travel.
Place washer at bottom of rocker arm stud.
Position rocker arm stud remover J 8934 on
rocker arm stud and tighten screws securely with
5/32" hex type wrench.
Fig. 6-1 1 1 Slots for Removing Rocker Arm Stud