Pontiac tempest 1968 Service Manual page 295

6-78 1968 P O N T I A C SERVICE MANUAL
Valves
Material
Intake ( H . O . and R . A . )
0
. G M
8 4 4 0
Steel with Aluminized Face and Flash Chrome Stem
Intake (Standard) SAE 1 0 4 1 Steel with Aluminized Face and Flash Chrome Stem
Exhaust (Standard) 2 1 - 2 N Steel with Aluminized Face-and Flash Chrome-Plated Stem
Exhaust ( H . O . and R . A . ) 2 1 - 2 N Steel with Aluminized-Swirl Polished Face and Chrome Plated Stem
Diameter of Head
Intake
Standard . . . 1 . 9 1 "
G T O , G P ,
4 2 8 ,
H . O . and R.A
. . . . 2 . 0 6 "
Exhaust
Standard 1 . 6 1 "
G T O , G P ,
4 2 8 ,
H . O . and R.A
1 . 7 2 "
Overall Length
Intake
3 5 0 2 - B b l . . 5 . 0 2 "
3 5 0 4 - B b l 5 . 1 2 "
G T O and H . O .
5 . 0 9 "
4 0 0 Reg. Fuel 4 . 9 9 "
4 0 0 Prem. Fuel and R . A . 5 . 0 8 "
GP &
4 2 8
and H . O .
. . 5 . 0 9 "
Exhaust
3 5 0 2 - B b l 5 . 0 1 "
3 5 0 4 - B b l . . . 5 . 1 9 "
G T O and H . O . .
5 . 0 8 "
4 0 0 Reg. Fuel . . . 4 . 9 8 "
4 0 0 Prem. Fuel and R.A . 5 . 0 7 "
GP &
4 2 8
and H . O
. . 5 . 0 8 "
Diameter of Stem » o 3 4 "
Stem to Guide Clearance
Intake
0 0 1 6 " - . 0 0 3 3 "
Exhaust
. 0 0 2 1 " - . 0 0 3 8 "
Valve Seat Angle
Intake 3 0 °
Exhaust . . 4 5 °
Valve Face Angle
Intake 2 9 °
Exhaust 4 4 °
Crankshaft
Material
3 5 0
and
4 0 0
4 2 8
o
Pearlitic Malleable Iron
N o . of Bearings 5
Main Bearing Material
3 5 0 Durex 1 0 0 - A
G T O and Firebird 4 0 0 Upper and # 5 Lower Durex 1 0 0 - A
G T O and Firebird 4 0 0 Lower E x c .
#
5 . . . Moraine 4 0 0 - A
Pontiac 4 0 0 E x c . # 4 Lower Durex 1 0 0 - A
Pontiac 4 0 0 # 4 Lower Moraine 4 0 0 - A
4 2 8 o . Moraine 4 0 0 - A
Thrust Taken O n • • • • N o - 4
Crankshaft Endplay •
. . . . 0 0 3 " - . 0 0 9 "
Journal Diameter
< 3 5 0
and
4 0 0 . 3 . 0 0 "
4 2 8 o 3 . 2 5 "
Main Bearing Length
Nos. 1, 2 , 3 94"
N o . 4-350 & 400 1 - 1 3 "
N o . 4-428 .
1
-
1
9 "
N o . 5 1-59"
Clearance .0002"-.0020"
Crankpin Diameter • • • 2 . 2 5
Flywheel and Sprockets
Flywheel
Material
Manual Cast Iron
Automatic Stamped Steel
N o . of Teeth . 1 6 6