6-36
1968 PONTIAC SERVICE
MANUAL
6-CYLINDER 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
-Barrel
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
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