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Engine
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Bore . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stroke . . . . . . . . . . . . . . . . . . . . . . . . .
Displacement (Cu. in.) . . . . . . . . . . . . . .
Compression Ratio . . . . . . . . . . . . . . . .
Horsepower 1 (Brake) 1965-66, 170 . . .
@ rpm
225 . .
1967-68, 170 . . .
225 . .
LA318-3 . . . . .
Torque 1 1965-66, 170 . . . . . . . . . . . . .
@ rpm
225 . . . . . . . . . . . . .
1967-68, 170 . . . . . . . . . . . . .
225 . . . . . . . . . . . . .
LA318-3 . . . . . . . . .
Std 2
Minimum cranking speed . . . . .
Trans
Compression pressure . . . . . . .
Max variation between cyls . . .
Auto 2
Minimum cranking speed . . . . .
Trans
Compression pressure . . . . . . .
Max variation between cyls . . .
Firing Order . . . . . . . . . . . . . . . . . . . . .
Basic Timing . . . . . . . . . . . . . . . . . . . . .
Recommended Governed
Speed Full Load . . . . . . . . . . . . . . . . . .
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3.40 in.
170 3.12 in.
225 4.12 in.
170-225
170 8.5:1
225 8.4:1
88 @ 3600
127 @ 3900
101 @ 4000
140 @ 3900
136 @ 1600
201 @ 2000
145 @ 1600
215 @ 1600
150 rpm
130-160 psi
15 psi
130 rpm
110-140 psi
20 psi
1-5-3-6-2-4
2½° B.T.D.C.
3500 rpm
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3.40 in.
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4.12 in.
225
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8.4:1
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127 @ 3900
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140 @ 3900
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201 @ 2000
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215 @ 1600
150 rpm
130-160 psi
15 psi
130 rpm
110-140 psi
20 psi
1-5-3-6-2-4
2½° B.T.D.C.
3500 rpm
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3.437 in.
4.5 in.
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250.6
7.0:1
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115 @ 3600
125 @ 3600
207 @ 1600
216 @ 1600
150 rpm
115-145 psi
15 psi
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1-5-3-6-2-4
5° B.T.D.C.
3200 rpm
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3.91 in.
3.312 in.
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318
-1 8.25:1 8.5 67-8
-3 7.50:1
-1 164 @ 3900
-3 165 @ 3900
-1 210 @ 4000
-3 202 @ 3900 '67
212 @ 4000 '68
-1 258 @ 2200
-3 260 @ 2200
-1 318 @ 2800
-3 288 @ 2400 '67
322 @ 2800 '68
100 rpm
-1 120-160 psi
-3 90-130 psi
20 psi
120 rpm
110-140 psi
20 psi
1-8-4-3-6-5-7-2
-1 10° B.T.D.C.
-3 12½° B.T.D.C.
-1 3900 rpm
-3 3700 rpm
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Camshaft -
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Bearing Clearance . . . . . . . . . . . . . .
End Play . . . . . . . . . . . . . . . . . . . . .
Bearing Diameter (1) . . . . . . . . . . . .
(2) . . . . . . . . . . . .
(3) . . . . . . . . . . . .
(4) . . . . . . . . . . . .
(5) . . . . . . . . . . . .
Camshaft Drive . . . . . . . . . . . . . . . .
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0.001-0.003 in.
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2.0015 in.
1.9845 in.
1.9695 in.
1.9535 in.
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Tooth Chain
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0.001-0.003 in.
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2.0015 in.
1.9845 in.
1.9695 in.
1.9535 in.
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Roller Chain
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0.002-0.004 in.
0.002-0.006 in.
2.0 in.
1.96 in.
1.93 in.
1.25 in.
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Roller Chain
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0.001-0.003 in.
0.002-0.006
2.000 x 0.86 in.
1.984 x 0.76 in.
1.969 x 0.76 in.
1.953 x 0.76 in.
1.5625 x 0.94 in.
-1 Silent Chain
-3 Roller Chain
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Connecting Rods -
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Standard Bearing Clearance . . . . . .
Maximum Allowable . . . . . . . . . . . .
Maximum Out of Round . . . . . . . . .
Maximum Taper . . . . . . . . . . . . . . .
End Play (318, 2 Rods) . . . . . . . . . .
Bearing Diameter . . . . . . . . . . . . . . .
Bearing Width . . . . . . . . . . . . . . . . .
Bearing Material (Con. Rod) . . . . . .
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0.0005-0.0015 in.
0.0025 in.
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0.006-0.012 in.
2.187 in.
1.015 in.
Steel-Backed
Babbit
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0.0005-0.0015 in.
0.0025 in.
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0.006-0.012 in.
2.187 in.
1.015 in.
Bi-Metal
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0.0005-0.0015 in.
0.0025 in.
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0.006-0.011 in.
2.12 in.
1.08 in.
Steel-Backed
Babbit
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-1 0.0005-0.0015"
-3 0.001-0.002 in.
0.003 in.
0.0005 in.
0.0005 in.
0.006-0.014 in.
-1 2.124-2.125 in.
-3 2.1235-2.1245"
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-1 Steel-Backed
Grid Type
-3 Tri-Metal
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Crankshaft -
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Main Bearing Clearance . . . . . . . . .
Maximum Allowable . . . . . . . . . . . .
Maximum Out of Round . . . . . . . . .
Maximum Taper . . . . . . . . . . . . . . .
Bearing Diameter . . . . . . . . . . . . . . .
End Play . . . . . . . . . . . . . . . . . . . . .
Bearing Material (Main) . . . . . . . . . .
Vibration Damper . . . . . . . . . . . . . .
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0.0005-0.0015 in.
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2.750 in.
0.0035-0.0085 in.
Steel-Backed
Yes
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0.0005-0.0015 in.
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2.750 in.
0.0035-0.0085 in.
Steel-Backed
Yes
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0.0005-0.0015 in.
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2.50 in.
0.003-0.007 in.
Steel-Backed
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-1 0.0015-0.0015"?
-3 0.001-0.002 in.
0.003 in.
0.0005 in.
0.0005 in.
2.4995-2.5005 in.
0.002-0.007 in.
-1 Steel-Backed
-3 Tri-Metal (1-4),
Steel-Backed (#5)
-1 No, -3 Yes
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Cylinders -
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Maximum Allowable Taper . . . . . . .
Maximum Allowable Out of Round .
Reconditioned Working Limits . . . . .
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0.010 in.
0.005 in.
0.001 in.
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0.010 in.
0.005 in.
0.001 in.
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0.010 in.
0.005 in.
0.001 in.
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0.001 in.
0.001 in.
0.005" Out of Round
0.010 in. Taper
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Pistons -
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Clearance Top Land . . . . . . . . . . . .
Skirt (Top) . . . . . . . . . . .
Service Fit (Feeler) . . . . .
Pounds Pull . . . . . . . . .
Piston Pin Diameter . . . . . . . . . . . . .
Length . . . . . . . . . . . . . . .
Clearance in Piston . . . . .
Rod . . . . . .
Service Fit at 70°F . . . . . . . . . . . . .
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0.025-0.030 in.
0.0005-0.0015 in.
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0.9008 in.
2.965 in.
0.00056-0.00075"
0.0007-0.0012 in.
Interference
Pressed In
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0.025-0.030 in.
0.0005-0.0015 in.
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0.9008 in.
2.965 in.
0.00045-0.00075"
0.0007-0.0012 in.
Interference
Pressed In
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0.0305 in.
0.0002-0.0012 in.
0.002 in.
6-9
0.859 in.
2.87 in.
0.000-0.0005 in.
0.0001-0.0004 in.
Thumb Press
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0.0015-0.0015 in.(?)
0.0015 x 0.50 Feeler
5-10
0.9841-0.9843 in.
2.990-3.000 in.
0.0000-0.0005 in.
0.0001-0.0004 in.
Selective
Full Floating
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Valves -
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Face Angle, Intake . . . . . . . . . . . . .
Exhaust . . . . . . . . . . . .
Seat Angle . . . . . . . . . . . . . . . . . . .
Stem Type, Intake . . . . . . . . . . . . . .
Exhaust . . . . . . . . . . . . .
Stem Diameter, Intake . . . . . . . . . .
Exhaust . . . . . . . . .
Head Diameter, Intake . . . . . . . . . .
Exhaust . . . . . . . . .
Hardened Inserts . . . . . . . . . . . . . . .
Guides, Removable . . . . . . . . . . . . .
Stem Clearance, Intake . . . .
Exhaust . . .
Lift, Intake . . . . . . . . . . . . . . . . . . .
Exhaust . . . . . . . . . . . . . . . . . .
Positive Rotators (Exhaust) . . . . . . .
Timing, Intake - Opens . . . . . . . . . .
- Closes . . . . . . . . . .
Exhaust - Opens . . . . . . . . . .
- Closes . . . . . . . . . .
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45°
43°
45°
Solid
Solid
0.372-0.373 in.
0.371-0.372 in.
1.620 in.
1.360 in.
None
No
0.001-0.003 in.
0.002-0.004 in.
0.375 in.
0.360 in.
No
BTC 8°
ABC 44°
BBC 48°
TDC
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45°
47°
45°
Solid
Stellite
0.372-0.373 in.
0.371-0.372 in.
1.620 in.
1.360 in.
None
No
0.001-0.003 in.
0.002-0.004 in.
0.371 in.
0.364 in.
Yes
BTC 8°
ABC 44°
BBC 48°
TDC
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45°
47°
45°
Solid
Solid
0.3405-0.3415 in.
0.3395-0.3405 in.
1.718 in.
1.501 in.
Alloy Steel (Ex)
Yes
0.001-0.003 in.
0.002-0.004 in.
0.379 in.
0.379 in.
No
BTC 12°
ABC 44°
BBC 50°
ATC 6°
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45°
45°
?°
Solid
-1,3 Solid
0.372-0.373 in.
0.371-0.372 in.
1.839-1.849 in.
-1 1.558-1.568 in.
-3 1.468-1.478 in.
All Stellite Faced
No
No
0.001-0.003 in.
0.002-0.004 in.
-1 0.380, -3 0.381"
-1 0.380, -3 0.381"
-1 Non-Positive
-3 Positive
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Tappets -
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Type . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting Screw . . . . . . . . . . . . . . .
Body Diameter . . . . . . . . . . . . . . . .
Clearance in Block . . . . . . . . . . . . .
Clearance (Hot), Intake . . . . . . . . . .
Exhaust . . . . . . . . .
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Mechanical
Self-Locking
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0.012 in.
0.024 in.
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Mechanical
Self-Locking
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0.012 in.
0.024 in.
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Mechanical
Self-Locking
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0.002 in. max.
0.010 in.
0.014 in.
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-1 Mechanical
-3 Hydraulic
Self-Locking
0.9040-0.9045 in.
0.0005-0.0015 in.
0.012 in.
0.022 in.
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Oil Pump -
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Type . . . . . . . . . . . . . . . . . . . . . . . .
Drive . . . . . . . . . . . . . . . . . . . . . . . .
Location . . . . . . . . . . . . . . . . . . . . .
Normal Pressure, psi . . . . . . . . . . . .
At rpm . . . . . . . . .
Capacity, gpm . . . . . . . . . . . . . . . . .
At rpm . . . . . . . . . . . . . . .
Intake Screen Type . . . . . . . . . . . . .
Crankcase Capacity (Less Filter) . . .
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Rotor
Camshaft
External
50
1000 @ engine
2.7
1000 @ pump
Fixed
5
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Rotor
Camshaft
External
50
1000 @ engine
2.7
1000 @ pump
Fixed
5
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Rotor
Camshaft
External
40
1000 @ engine
2.5
1000 @ pump
Fixed
5
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Rotor
Camshaft
In Sump
-1 50-70 -3 60-80
1000 @ engine?
2.7 gpm
1000 @ pump?
Fixed
5
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Notes:
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1
Motors Truck Repair Manual,
21st Edition, 1960-68
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2
Compression pressure taken with engine warm, all spark plugs removed,
throttle wide open, at a minimum cranking speed indicated above.
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