Pontiac tempest 1968 Service Manual page 296

V-8 E N G I N E
6-79
Starter Motor Drive
N o , of Teeth .
0
< , 9
Crankshaft Sprocket
Material .
0
. . . . Carburized and Hardened Steel
N o . of Teeth 21
Camshaft Sprocket
Material Aluminum A l l o y with N y l o n Covered Teeth
N o . of Teeth 42
Timing Chain Link Type - Single Side Guide
N o . of Links 60
Harmonic Balancer . Cast Iron with Bolt on Stamped Pulley
Camshaft
Material Hardened A l l o y Cast Iron
Bearings
Number . . . . . • » 5
Type . „ . Steel Backed Babbitt
Diameter-All 1.9"
Valve System
Valve Lifter
Type . Hydraulic
Leak-Down Rate . . 20-90 Sec. w i t h 50 Lb. Load
Plunger Travel (For Gauging Purposes) . 1 2 5 "
Push rod
Material Steel Tubing
Length
Standard . . . . . v . . . . . . . . . . . . . . 8 . 7 2 "
G T O , & Firebird 400 G P , & 428 . . . 9 . 1 6 "
Rocker Arm
Material Stamped Steel
Ratio 1.5 to 1
Rocker Arm Stud
Standard Pressed in to Head
G T O , & Firebird 4 0 0 , G P , & 428 & 400 R.A Screwed in to Head
Lubrication System
Type of Lubrication
M a i n Bearings » . Pressure
Connecting Rods Pressure
Piston Pins Splash
Camshaft Bearings . Pressure
Lifters & Rocker Arms . Pressure
Timing Gears & Chain Metered Jet
Cylinder Walls . Metered Jet
O i l Pump
Type Spur Gear
O i l Pickup Stationary Screen
Pressure
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30- 40 @ 2600 RPM
GTO & 428 . . . . . . . . . . . . 45-50 @ 2600 RPM
O i l Capacity 5 Q t s .
with Filter 6 Q t s .
Fuel System
Fuel Pump Pressure (PSI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . 0 - 6 . 5 PSI
Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sintered Bronze on 2 BBL
Pleated Paper on Q ' J e t
Carburetor
Type
2 - B b l . . . . . Rochester 2 GC
4 Bbl Rochester Quadrajet
Barrel Size
2 - B b l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.688"
Q ' J e t 1.375" Primary, 2.250 Secondary
Cooling System
Radiator Cap Pressure (PSI) 14-17
Thermostat Opens A t 190° F
Water Pump Rate (GPM) 17