Camshaft And Drive; Pistons And Connecting Rods; Valve Train; Combustion Chamber - Pontiac Grand Prix Service Manual

V-8
ENGINE 6-39
Fig. 6-69 Combustion Chamber
-
Standard Head
Fig. 6-67 Cylinder Block
-
350,400 and 428
Bonneville Engines
been revised to 45" for increased durability and
efficiency. Some early 1969 engines will, however, still
retain the 30" seat angle.
CAMSHAFT AND DRIVE
Six different camshafts are used. The engine charts
(Figs. 6-1, 6-2 and 6-3) show the application of each.
Camshafts can be identified by a letter stamped on the
front end of the shaft.
PISTONS AND CONNECTING RODS
The pistons used
in
all compression ratio engines are
Fig. 6-68 Cylinder Block 400 Ram Air and 428,
Except Standard 428 Bonneville
flat on top as shown in Fig. 6-71. The top of the piston
has a relief machined into it for valve clearance.
VALVE TRAIN
All V-8 engines utilize the simple ball pivot-type valve
train, consisting of the valve, rocker arm, push rod,
and valve lifter.
All valve lifters are of the hydraulic type, except that
those used in ram air engines are of the limited travel
design.
Rocker studs are pressed into the cylinder head on the
standard engines and are screwed in on G.T.O., Grand
Fig. 6-70 Combustion Chamber
-
Large Head