GM Service Manual Online
For 1990-2009 cars only

Application

Specification

Metric

English

General

  • Engine Type

V-8

  • Displacement

4.6 Liter

279 cu in

  • RPO

LH2

  • VIN

A

  • Bore

93 mm

3.661 in

  • Stroke

84 mm

3.3071 in

  • Compression Ratio

10.5:1

  • Engine Compression Test

965-1172 kPa

140-170 psi

  • Firing Order

1-2-7-3-4-5-6-8

  • Spark Plug Gap

1.270 mm

0.0500 in

Block

  • Crankshaft Main Bearing Bore Diameter

72.430-72.442 mm

2.8516-2.8521 in

  • Crankshaft Main Bearing Bore Out-of-Round

0.010 mm

0.0004 in

  • Crankshaft Main Rear Oil Seal
  • Bore

115.962-116.038 mm

4.5654-4.5684 in

  • Runout

0.250 mm

0.0098 in

  • Cylinder Bore Diameter @ 41 mm (1.610 in) Below Deck Face

92.992-93.008 mm

3.6611-3.6617 in

  • Cylinder Bore Out-of-Round
  • Production

0.010 mm

0.0004 in

  • Service

0.100 mm

0.0039 in

  • Cylinder Bore Taper
  • Production

0.010 mm

0.0004 in

  • Service

0.100 mm

0.0039 in

  • Cylinder Head Deck Height

224.55 mm

8.8406 in

  • Cylinder Head Deck Surface Flatness

0.100 mm

0.0039 in

Camshaft

  • Camshaft End Play

0.120-0.220 mm

0.0050-0.0087 in

  • Camshaft Journal Diameter

26.948-26.972 mm

1.0610-1.0619 in

  • Camshaft Journal Out-of-Round

0.006 mm

0.0002 mm

  • Camshaft Journal to Bore Clearance
  • Production

0.051-0.076 mm

0.0020-0.0030 in

  • Service

0.040-0.090 mm

0.0016-0.0035 in

  • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust

246 degrees

  • Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake

251 degrees

  • Camshaft Lobe Lift - Exhaust

5.94 mm

0.2339 in

  • Camshaft Lobe Lift - Intake

6.15 mm

0.2421 in

  • Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift

0.0 degrees

  • Camshaft Runout

0.050 mm

0.0020 in

  • Camshaft Thrust Surface
  • Runout

0.037 mm

0.0015 in

  • Width

22.990-23.090 mm

0.9051-0.9091 in

  • Camshaft Timing @ 0.150 mm (0.006 in) Lift
  • Intake Opens

11.0 degrees ATDC

  • Intake Centerline

133.0 degrees ATDC

  • Intake Closes

255.7 degrees ATDC

  • Exhaust Opens

243.2 degrees BTDC

  • Exhaust Centerline

107.0 degrees BTDC

  • Exhaust Closes

11.3 degrees ATDC

Camshaft Position Actuator

  • Exhaust Authority

50 crankshaft degrees/25 camshaft degrees

  • Intake Authority

40 crankshaft degrees/20 camshaft degrees

Cooling System

  • Thermostat Full Open Temperature

85°C

185°F

Connecting Rod

  • Connecting Rod Bearing Clearance
  • Production and Service

0.0250-0.0760 mm

0.0010-0.0030 in

  • Connecting Rod Bore Diameter - Bearing End

57.136-57.152 mm

2.2495-2.2501 in

  • Connecting Rod Bore Diameter - Pin End

23.002-23.014 mm

0.9056-0.9061 in

  • Connecting Rod Bore Out-of-Round - Bearing End

0.006 mm

0.0002 in

  • Connecting Rod Bore Out-of-Round - Pin End

0.005 mm

0.0002 in

  • Connecting Rod Length Center to Center

151.00 mm

5.9449 in

  • Connecting Rod Side Clearance

0.200-0.500 mm

0.0079-0.0197 in

  • Connecting Rod Straightness

0.050 mm

0.0020 in

Crankshaft

  • Connecting Rod Journal Diameter

53.947-53.963 mm

2.1239-2.1245 in

  • Connecting Rod Journal Out-of-Round

0.005 mm

0.0002 in

  • Connecting Rod Journal Taper

0.005 mm

0.0002 in

  • Connecting Rod Journal Width

43.840-43.960 mm

1.7260-1.7307 in

  • Crankshaft Balancer
  • Surface Diameter

50.730-50.870 mm

1.9972-2.0028 in

  • Hub Inside Diameter

34.847-34.864 mm

1.3719-1.3726 in

  • Crankshaft End Play

0.050-0.500 mm

0.0020-0.0197 in

  • Crankshaft Main Bearing Clearance
  • Production

0.0150-0.0550 mm

0.0006-0.0022 in

  • Service

0.0150-0.0635 mm

0.0006-0.0025 in

  • Crankshaft Main Journal Diameter

64.350-64.366 mm

2.5335-2.5341 in

  • Crankshaft Main Journal Out-of-Round

0.005 mm

0.0002 in

  • Crankshaft Main Journal Taper

0.005 mm

0.0002 in

  • Crankshaft Main Journal Thrust Wall Runout

0.040 mm

0.0016 in

  • Crankshaft Main Journal Thrust Wall Square

0.010 mm

0.0004 in

  • Crankshaft Main Journal Width, #1, #2, #4, #5

24.540-24.660 mm

0.9661-0.9709 in

  • Crankshaft Main Journal Width, Thrust #3

25.150-25.250 mm

0.9902-0.9941 in

  • Crankshaft Nose Diameter
  • From Front Face 0.00-21.00 mm (0.0000-0.8268 in)

34.500-34.750 mm

1.3583-1.3681 in

  • From Front Face 21.00-53.00 mm (0.8268-2.0866 in)

34.892-34.912 mm

1.3737-1.3745 in

  • From Front Face 53.00 to Rolled Fillet (2.0866-Rolled Fillet)

33.450-33.550 mm

1.3169-1.3209 in

  • From Front Face 89.94-110.54 mm (3.5409-4.3520 in)

44.950-45.000 mm

1.7697-1.7717 in

  • Crankshaft Nose Runout
  • From Front Face 0.00-21.00 mm (0.0000-0.8268 in)

0.100 mm

0.0039 in

  • From Front Face 21.00-53.00 mm (0.8268-2.8066 in)

0.030 mm

0.0012 in

  • From Front Face 53.00 to Rolled Fillet (2.0866-Rolled Fillet)

0.100 mm

0.0039 in

  • From Front Face 89.94-110.54 mm (3.5409-4.3520 in)

0.025 mm

0.0010 in

  • Crankshaft Rear Flange
  • Diameter

95.880-95.980 mm

3.7748-3.7787 in

  • Runout

0.025 mm

0.0010 in

  • Crankshaft Rear Flange Face to Engine Flywheel Runout

0.025 mm

0.0010 in

  • Crankshaft Runout
  • Main Journals #1, #5

0.022 mm

0.0009 in

  • Main Journals #2, #4, #6

0.025 mm

0.0010 in

Cylinder Head

  • Camshaft Bearing Bore Diameter

27.013-27.033 mm

1.0635-1.0642 in

  • Camshaft Bearing Bore Out-of-Round

0.010 mm

0.0004 in

  • Combustion Chamber Depth - at Measurement Point

10.470-10.710 mm

0.4122-0.4217 in

  • Cylinder Head Height - Deck to Camshaft Centerline Bore

136.00 mm

5.3543 in

  • Surface Flatness - Block Deck

0.050 mm

0.0020 in

  • Surface Flatness - Exhaust Manifold Deck

0.220 mm

0.0087 in

  • Surface Flatness - Intake Manifold Deck

0.220 mm

0.0087 in

  • Valve Guide Bore - Exhaust

5.969-5.989 mm

0.2350-0.2359 in

  • Valve Guide Bore - Intake

5.969-5.989 mm

0.2350-0.2359 in

  • Valve Guide Installed Height - Exhaust

14.300 mm

0.5630 in

  • Valve Guide Installed Height - Intake

14.720 mm

0.5795 in

  • Valve Lifter Bore Diameter

12.013-12.037 mm

0.4730-0.4739 in

Flywheel

  • Runout

0.300 mm

0.0118 in

Intake Manifold

  • Surface Flatness

0.500 mm

0.0200 in

Lubrication System

  • Oil Capacity - with New Dry Oil Filter

7.6 Liters

8.0 Quarts

  • Oil Capacity - without Oil Filter Change

7.1 Liters

7.5 Quarts

  • Oil Pressure - Minimum @ Idle

35 kPa

5 psi

  • Oil Pressure - Minimum @ 2,000 RPM

250 kPa

35 psi

Piston Rings

  • Piston Ring End Gap
  • First Compression Ring

0.250-0.400 mm

0.0098-0.0157 in

  • Second Compression Ring

0.350-0.050 mm

0.0138-0.0020 in

  • Oil Control Ring

0.250-0.760 mm

0.0098-0.0299 in

  • Piston Ring to Groove Clearance
  • First Compression Ring

0.040-0.095 mm

0.0016-0.0037 in

  • Second Compression Ring

0.040-0.095 mm

0.0016-0.0037 in

  • Oil Control Ring

None - Side Sealing

  • Piston Ring Thickness
  • First Compression Ring

1.199-1.203 mm

0.0472-0.0474 in

  • Second Compression Ring

1.499-1.504 mm

0.0590-0.0592 in

  • Oil Control Ring

2.530-2.555 mm

0.0996-0.1006 in

Pistons and Pins

  • Piston
  • Piston Diameter @ 42 mm (1.6353 in) Below Crown

92.957-92.972 mm

3.6597-3.6603 in

  • Piston Pin Bore Diameter

23.002-23.007 mm

0.9056-0.9058 in

  • Piston Ring Groove Inside Diameter
  • First Compression Ring

84.750-85.000 mm

3.3366-3.3464 in

  • Second Compression Ring

83.400-83.650 mm

3.2835-3.2933 in

  • Oil Control Ring

85.670-85.920 mm

3.3728-3.3827 in

  • Piston Ring Groove Width
  • First Compression Ring

1.230-1.255 mm

0.0484-0.0494 in

  • Second Compression Ring

1.530-1.555 mm

0.0602-0.0612 in

  • Oil Control Ring

2.530-2.555 mm

0.0996-0.1006 in

  • Piston to Bore Clearance

0.020-0.051 mm

0.0008-0.0020 in

  • Pin
  • Piston Pin Clearance to Connecting Rod Bore

0.002-0.014 mm

0.0001-0.0006 in

  • Piston Pin Clearance to Piston Pin Bore

0.002-0.012 mm

0.0001-0.0005 in

  • Piston Pin Diameter

22.995-23.000 mm

0.9053-0.9055 in

  • Piston Pin End Play
  • Piston Pin Length

61.500-62.000 mm

2.4213-2.4409 in

Valve System

  • Valves
  • Valve Face Angle

45 degrees

  • Valve Face Runout

0.038 mm

0.0015 in

  • Valve Face Width
  • Exhaust

1.500 mm

0.0591 in

  • Intake

1.000 mm

0.0394 in

  • Valve Head Diameter
  • Exhaust

28.880-29.140 mm

1.1370-1.1472 in

  • Intake

36.090-36.350 mm

1.4209-1.4311 in

  • Valve Length
  • Exhaust

91.730-91.990 mm

3.6114-3.6217 in

  • Intake

110.600-110.860 mm

4.3543-4.3646 in

  • Valve Seat Angle

45.75 degrees

  • Valve Seat Relief Angle

20 degrees

  • Valve Seat Relief Width
  • Exhaust

0.160-0.360 mm

0.0063-0.0142 in

  • Intake

0.110-0.310 mm

0.0043-0.0118 in

  • Valve Seat Runout

0.050 mm

0.0020 in

  • Valve Seat Undercut Angle
  • Exhaust

65 degrees

  • Intake

60 degrees

  • Valve Seat Width
  • Exhaust

1.300-1.700 mm

0.0512-0.0669 in

  • Intake

0.420-0.820 mm

0.0165-0.0323 in

  • Valve Stem Diameter

5.920-5.940 mm

0.2331-0.2339 in

  • Valve Stem Out-of-Round

0.008 mm

0.0003 in

  • Valve Stem Straightness

0.013 mm

0.0005 in

  • Valve Stem-to-Guide Clearance
  • Exhaust
  • Production

0.050-0.100 mm

0.0020-0.0039 in

  • Service

0.050-0.120 mm

0.0020-0.0047 in

  • Intake
  • Production

0.028-0.068 mm

0.0011-0.0027 in

  • Service

0.028-0.110 mm

0.0011-0.0043 in

  • Valve Lifters
  • Valve Lifter Diameter

11.986-12.000 mm

0.4719-0.4724 in

  • Valve Lifter-to-Bore Clearance

0.037-0.041 mm

0.0015-0.0016 in

  • Rocker Arms
  • Valve Rocker Arm Ratio

1.68 to 1

  • Valve Rocker Arm Roller Diameter

17.740-17.800 mm

0.6984-0.7008 in

  • Valve Springs
  • Valve Spring Coil Thickness

4.110 x 3.280 mm

0.1618 x 0.1291 in

  • Valve Spring Diameter
  • Inside

17.750-18.250 mm

0.6988-0.7185 in

  • Outside

26.23 mm

1.0327 in

  • Valve Spring Free Length

40.790-43.690 mm

1.6059-1.7201 in

  • Valve Spring Height
  • Closed

35.000 mm

1.3780 in

  • Open

24.500 mm

0.9646 in

  • Valve Spring Load
  • Closed

211.4-233.4 mm

47.5-52.4 lb

  • Open

579.0-631.0 mm

130.2-141.9 lb

  • Valve Spring Total Number of Coils

6.90-7.10