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6A2-24
1977 PONTIAC SERVICE MANUAL
SPECIFICATIONS
BOLT TORQUE
Bolt Main Bearing to Block
...................................
65 1b.ft.
................................................
Nut Connecting Rod
30 1b.ft.
..................................................
Bolt Oil Pan Front
45 1b.in.
Bolt Oil Pan Side
....................................................
80 1b.in.
..................................................
Plug Oil Pan Drain
20 Ib.ft.
Nut Oil Screen Support
............................................
25 1b.ft.
Bolt Oil Pump to Block
........................................
115 1b.in.
Bolt Oil Pump Cover
.............................................
105 Ib.in.
..............................
Bolt Push Rod Cover To Block
75 Ib.in.
Bolt Harmonic Balancer
........................................
160 Ib.ft.
Bolt Flywheel To Crankshaft
...................................
55 1b.ft.
Nut Carburetor to Manifold
....................................
12 1b.ft.
...........................
Bolt Intake To Exhaust Manifold
40 1b.ft.
Nut Manifold To Cylinder Head
.............................
30 1b.ft.
Bolt Manifold To Cylinder Head
............................
40 1b.ft.
Nut EGR Feed Tube
...............................................
60 1b.ft.
Bolt Fuel Pump To Block
........................................
15 1b.ft.
...................................
Bolt Distributor Hold Down
22 1b.ft.
Bolt EGR Valve to Manifold
...................................
20 Ib.ft.
Bolt Water Outlet Housing
.....................................
20 1b.ft.
Bolt Water Pump To Block
....................................
18 1b.ft.l
Bolt Timing Cover To Block
...................................
80 1b.in.
Bolt Timing Cover To Oil Pan
...............................
45 1b.in.
Bolt Fan & Pulley To Water Pump
........................
18 1b.ft.
Clamps Radiator Hoses All
.....................................
17 1b.in.
Stud Rocker Arm To Cylinder Head
......................
60 1b.ft.
Bolt Cylinder Head To Block
.................................
95 1b.ft.I
Nut Rocker Arm To Stud
.......................................
20 1b.ft.
..........................................
Bolt Rocker Arm Cover
85 1b.in.
Bolt Camshaft Thrust Plate To Block
....................
75 1b.in.
'Requires thread sealer.
ENGINE
Type
...........................................................................
In-Line
Valve Arrangement
..................................................
In Head
Bore and Stroke
.............................................
4.00"
X
3.00"
Piston Displacement
............................................
15 1 cu. in.
......................................................
Compression Ratio
8.25:l
Compression Pressure at Cranking Speed
..........................
Wide-Open Throttle
140 psi
@
160 rpm
...............................................................
Firing Order
1-3-4-2
Production Engine Number
.............................
Pad at Right
Side by Distributor Shaft Hole
.............................
Cylinder Numbers-Front to Rear
1-2-3-4
CAMSHAFT
Material-Camshaft
..................
Hardened Alloy Cast Iron
Material-Cam Bearings
............................
Babbet on Steel
....................................................
Journal Diameter
1.869"
....................................
Bearing Clearance
.0007"
-
.0027"
...................................................
End Play
.0015"
-
.0050"
CONNECTING RODS
Material-Connecting Rods
..............................
Anna-Steel
.......................................
Length, Center to Center
6.050"
Bearing Clearance on Crankpin-Limits
............................................
When New
.0005"
-
.0026"
End Play of Connecting Rod on
...................................................
Crankpin
.006"
-
.022"
CRANKSHAFT
............................
Material-Crankshaft
Cast Nodular Iron
...............................
Journal Diameter
2. 2983"
-
2. 2993"
.........................................................
Thrust Taken On
#
5
..................................
Crankpin Journal Diameter
2. 000"
...................
End Play-Limits When New
.0015"
-
.0085"
Main Bearing Clearance-Limits
............................................
When New
.0002"
-
.0022"
PISTONS AND CYLINDERS
...........................................
Cylinder Bore Diameter
4.00"
...........
Piston Material
Tin Plated Cast Aluminum Alloy
.................
Piston Clearance in Cylinder..
.0025"
-
.0033"
..........................................
Piston Ring Gap
.01OV
-
.020"
Piston Ring to Groove Clearance
Compression Rings
.............................
Upper and Lower
.0015"
-
.0035"
PISTON PINS
...........................................
Piston Pin Material
SAE 1016
....................................
Fit in Piston
.0002"
-
.0004" loose
...........................................................
Fit in Rod
Press Fit
.........................................
Diameter (Selective)
.942
-
.938
.......................................................................
Length
3.000
SPROCKETS
.............................
Camshaft-Material
Bakelite and Fabric
Composition with Steel Hub
-Number of Teeth
......................................................
54
...........................................
Crankshaft-Material
Cast Iron
......................................................
-Number of Teeth
26
VALVE TIMING (IN CRANKSHAFT
DEGREES)
Intake
............................................................
Opens
33" BTC
...........................................................
Closes
81' ABC
..............................................................
Duration
294"
...........................................
Lift
(@
Zero Lash)
.406"
Exhaust
............................................................
Opens
76" BBC
...........................................................
Closes
3V ATC
..............................................................
Duration
294"
...........................................
Lift (@ Zero Lash)
.406"
VALVES
..................................................
Material
Intake-1 541 Steel
Exhaust 21-2N Steel
...................................................
Lash-Intake
&
Exhaust
0
..............................................
Head Diameter-Intake
1.72"
.................................................................
-Exhaust
1 SO"
Stem Diameter
Intake & Exhaust
....................................................
.34"
Face Angle-Intake
&
Exhaust
......................................
45'
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