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6A5-2
1977 PONTIAC SERVICE MANUAL
FIG. 6A5-01 V8 SIDE VIEW
-
TYPICAL
All main bearing caps are doweled to the cylinder block
to assure accurate alignment and facilitate assembly.
Fig. 6A5-02 Cylinder Block 3 0 1
CYLINDER HEAD
Cylinder heads (Fin. 6A5-043 have fully machined
c o m b u k m chambers. Inaddition, all exhaust valve seats are
induction hardened, making them more resistant to wear.
Valve guides are cast integral with the cylinder head.
CRANKSHAFT A N D BEARINGS
The crankshaft is cast nodular iron and is supported by
five main bearings. The rear main bearing shells have two oil
grooves. When replacing main bearings, it is very important
that bearings are installed with the recommended material
(M400-A) located in the proper position on the crankshaft
(upper
&
lower).
The rear main bearing is sealed by a packing, seated in
a groove in the block and bearing cap. A slinger on the
crankshaft in front of the seal and the drain groove in the rear
Fig. 6A5-03 Cylinder Block 350-400
main bearing prevent an excess of oil from getting to the seal.
CAMSHAFT A N D DRIVE
Camshafts may be identified by a letter stamped on the
rear end of the shaft.
Camshafts are cast from alloy iron and cam lobes are
ground and hardened. The camshaft is driven by a
combination of metal gears and a link chain.
PISTONS A N D CONNECTING
RODS
Pistons are of a light weight cast all aluminum slipper
skirt type. These pistons maintain thermal control through
contour grinding. Two compression rings and one oil control
ring are used, all of which are located above the piston pin.
(Fig. 6A5-05).
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