Pontiac FIREBIRD 1972 Service Manual page 561

V-8 ENGINE 6-49
Fig. 6 - 7 6 Cylinder Block
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All Except 4 5 5 H.O. Engine
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--
Fig. 6-77 Cylinder Block
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4 5 5 H.O. Engine
W E ~ E D IN
OR
S R E W E D IN ROCKER
k s w
n m
ARM
n u D
GUIDE PLATE
Fig. 6-78 Cylinder Head
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Typical
Fig. 6-79 Combustion Chamber
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Typical
CRANKSHAFT AND BEARINGS
The crankshaft is cast nodular iron and is supported by
five main bearings. The rear main bearing shells have two
oil grooves (Fig. 6-8 1). When replacing main bearings, it
is very important that bearings are installed with the
recommended material (M100-A or M400-A) located in
the proper position on the crankshaft (upper & lower).
Refer to V-8 engine specifications for detailed bearing
usage. Torsional vibration is dampened by the harmonic
balancer mounted on the front end of the crankshaft. The
harmonic balancer consists of a hub and a rubber mounted
I
VALVE SEAT WATER JACKET
Fig. 6 - 8 0 Water Jacket for Valve Cooling