Pontiac tempest 1968 Service Manual page 253

6-36
1968 P O N T I A C SERVICE M A N U A L
6 - C Y L I N D E R
ENGINE SPECIFICATIONS
(Cont.)
Timing
- Camshaft . . . . . . . . . . 1-Bbl. Q ? Jet
- Intake Opens (BTC) (DEG) . . . . 14 14
Closes (ABC) (DEG)
9
. 46 50
Duration (DEG) . 240 244
Lift (IN) .400" .438"
- Exhaust Opens (BBC) (DEG) 46 52
Closes (ATC) (DEG) 14 12
Duration (DEG) 240 244
Lift (IN) .400" .438"
Valve Overlap (DEG) 28 26
Valve Springs 1-Bbl. Q'Jet
Pressure @ Length
PSI PSI
Outer 165-175 @ 1.233" 116-128 @ 1.193"
94-100 @ 1.663" 62-68 @ 1.633"
Inner - 58-64 @ 1.173"
_ 29-35 @ 1.613"
Valves
Material - Intake SAE 1041 Steel with Aluminized Face and Chrome-Plated Stem
- Exhaust 21-2N Steel with Aluminized Face and Chrome-Plated Stem
Diameter of Head - Intake . . 1.92"
- Exhaust 1.60"
Overall Length - Intake - 1-Bbl. 4.81"
- Q ? Jet . . . . . . . . . . 4.90"
- Exhaust - 1-Bbl. 4.80"
- Q'Jet . . 4.89"
Diameter of Stem .34"
Stem to Guide Clearance - Intake 0016"-.0033"
- Exhaust . . . . . .0021"-.0038"
Valve Seat Angle - Intake 30°
- Exhaust 45°
Valve Face Angle - Intake , 29°
- Exhaust 44°
Lubrication System
Type of Lubrication - Main Bearings Pressure
- Connecting Rods Pressure
- Piston Pins Splash
- Camshaft Bearings . . ® ® * Pressure
- Lash Adjusters and Cam Followers Pressure
- Timing Gears & Belt None
- Cylinder Walls Metered Jet
Oil Pump - Type Spur Gear - Externally Mounted
- Oil Pickup , Stationary Screen
- Pressure . * 26-36 PSI @ 2800 rpm
Oil Capacity 5 Qts.
- With Filter . . . . . . . . . . . . . . . . . . . . . . . . . 6 Qts.
Fuel System
Fuel Pump Pressure (PSI) 4.5-5.5
Fuel Filter Pleated Paper (MV) Sintered Bronze (BV) in Carburetor
Carburetor-Type-1 Bbl. MT „ Rochester Mono jet
-1 Bbl. AT . Rochester BV
-4 Bbl. Rochester Quadrajet
- B a r r e l Size-1 Bbl 1.75" (MV) 1.75"(BV)
-Q'Jet 1.38 Primary, 2.25 Secondary
Cooling System
Radiator Cap Pressure (PSI) 14-17
Thermostat Opens At 190°F
Water Pump Rate (GPM) i . . . . . . . 16