Pontiac FIREBIRD 1972 Service Manual page 615

V-8 ENGINE 6-1 03
VALVES
Material
Intake
..................
G M 8440 Steel with Aluminized
Face and Flash Chrome Plated Stem
Exhaust
..............
2 1-2 Steel with Aluminized Face
and Flash Chrome Plated Stem
Diameter of Head
Intake
350. 400 and 455 2 Bbl
.............................
1.96"
400 and 455 4 Bbl
.....................................
2.1 1 "
Exhaust
350. 400 and 455
.....................................
1.77"
Overall Length
Intake
350 and 400 2 Bbl
...................................
4.982"
455 (exc
.
H.O.)
........................................
4.881"
455 p . 0 . and 400 4 Bbl
.........................
4.960"
Exhaust
350 and 400 2 Bbl
...................................
4.971"
455 (exc . H.O.)
........................................
4.870"
455 H.O. and 400 4 Bbl
.........................
4.949"
Diameter of Stem
.....................................
. .
. . . . . . . .
34"
Stem to Guide Clearance
Intake
...............................................
0016"
- .
0033"
Exhaust
...........................................
002 1 " - . 0038"
Valve Seat Angle
........................................
Intake
-
Large Valves 30"
........................................
Intake
-
Small Valves 45"
Exhaust
..............................................................
45"
Valve Face Angle
Intake
-
Large Valves
........................................
29"
........................................
Intake
-
Small Valves 44"
Exhaust
............................................................
44"
VALVE TIMING (In Crankshaft Degrees)
Camshaft
. . . . . . . . . . . . . .
483555 9779066 9779067 9779068
Intake
.
. . . . . . . . . .
Owns (BTC) 26"
~ioses (ABC)
. . . . . . . . . .
63" 63" 70" 77"
Duration
. . . . . . . . . . . .
269" 273" 273" 288"
Lift
(@
Zero Lash)
. . . . . . . .
.
374"
.
404"
.
403"
.
408"
Exhaust
Opens (BBC)
. . . . . . . . . .
72" 77" 7 8" 90"
Closes
(
ATC)
. . . . . . . . . .
25" 23" 31" 32"
Duration
. . . . . . . . . . . .
277" 282" 289" 302"
Lift
(@
Zero Lash)
. . . . . . . .
.
407 " .408"
.
406"
.
406"
Valve Overlap
. . . . . . . . . . .
51" 55" 54" 63"
CRANKSHAFT
Material
...............................................
Nodular Iron
No
.
of Bearings
............................................... ........
5
Main Bearing Type
350 and 400 2 Bbl .
All exc
.
#4 lower
......................
Moraine 100-A
#4 lower
....................................
Moraine 400-A
400 4 Bbl
.
All uppers
..................................
Moraine 100-A
All lowers exc
.
#5
....................
Moraine 400-A
#
5 lower
....................................
Moraine 100-A
455 4 Bbl
.
All exc
.
#5 upper
......................
Moraine 400-A
#5 upper
....................................
Moraine 100-A
455 2 Bbl
.
All lowers
..................................
Moraine 400-A
All uppers
..................................
Moraine 100-A
Thrust Taken On
..............................................
No
.
4
Crankshaft Endplay
...............................
003"
-
.
009"'
Journal Diameter
350 and 400
...................................................
3.00"
455
.................................................................
3.25"
Main Bearing Length
.......................................................
Nos
.
1, 2, 3 94"
.
........................................
No 4-350 and 400 1.13"
. ........................................................
NO 4-455 1.19"
..............................................................
N o . 5 1.59"
Main Bearing Clearance
All exc
.
455
.....................................
0002"
- .
0017"
455(Exc
.
Small Valve No
.
1 Location)
.....................................................
0005"
- .
0021"
455 Small Valve No . 1 Location
....................................................
0003" . . 0019"
............................................
Crankpin Diameter 2.25"
FLYWHEEL AND SPROCKETS
Flywheel
'
Material
Manual
..................................................
Cast Iron
Automatic
....................................
Stamped Steel
No
.
of Teeth
......................................................
166
'Starter Motor Drive
.
..........................................................
No of Teeth 9
Crankshaft Sprocket
Material
............................
Hardened Sintered Iron
No . of Teeth
........................................................
21