Rocker Arm Studs; Valve Seats - Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual

6 A 1-16 IN-LINE 6
Fig. 6A1-1 8-R em oving Rocker Arm Stud - T ypical
1 . Place the gasket in position over the dowel pins.
2. Carefully guide cylinder head into place over dowel
pins and gasket.
3. Coat threads of cylinder head bolts with sealing
compound, #1052080 or equivalent, and install finger
tight.
4. Tighten cylinder head bolts a little at a time in the
sequence shown on the torque sequence chart until 95 lb.
ft. (129N-m) torque is reached.
The left-hand front head bolt torques to 85
NOTICE:
lb. ft. (115N*m).
5. Connect radiator upper hose and engine ground
strap.
. Connect temperature sending unit wires and install
6
fuel and vacuum lines in clip at*water outlet.
7. Fill cooling system.
8 . Install manifold assembly as previously outlined.
9. Install and adjust valve mechanism as previously
outlined.
10. Install and torque rocker arm cover.
11. Connect A IR pipe (if so equipped).

ROCKER ARM STUDS

Replacement
Rocker arm studs that have damaged threads or are
loose in cylinder heads should be replaced with new studs
available in .003" and .013" oversize. Studs may be installed
after reaming the holes as follows:
1 . Remove old stud by placing Tool J-5802-A over the
stud, installing nut and flat washer and removing stud by
turning nut (fig. 6A1-18).
2. Ream hole for oversize stud using Tool J-5715 for
.003" oversize or Tool J-6036 for .013" oversize (fig. 6A1-
19).
CAUTION: Do not attempt to install an
oversize stud without reaming stud hole.
3. Coat press-fit area of stud with hypoid axle lubricant.
Install new stud, using Tool J-6880 as a guide. Gage should
LIG H T TRUCK S ER V ICE MANUAL
Fig. 6A1-19--Ream ing Rocker Arm Stud Bore - Typical
bottom on head (fig. 6 A 1 - 20
VALVE GUIDE BORES
Valves with oversize
specifications). To ream the valve guide bores for oversize
valves, use Tool Set J-5830.

VALVE SEATS

Reconditioning the valve seats is very important,
because the seating of the valves must be perfect for the
engine to deliver the power and performance built into it.
Another important factor is the cooling of the valve
heads. Good contact between each valve and its seat in the
head is imperative to insure that the heat in the valve head
will be properly carried away.
Several different types of equipment are available for
reseating valves seats. The recommendations of the
manufacturer of the equipment being used should be
carefully followed to attain proper results.
Regardless of what type of equipment is used, however,
Fig. 6A1-20--lnstalling Rocker Arm Stud - Typical
OVERSIZE
REAMER
).
stems are available (see