Chevrolet Silverado / GMC Sierra. Manual - part 388
SEALERS, ADHESIVES, AND LUBRICANTS
Valve Springs-Valve Spring Free Length -
Production Value
56.6 mm
2.2283 in
Valve Springs-Valve Spring Installed Height -
Production Value
41 mm
1.6142 in
Valve Springs-Valve Spring Load - Exhaust -
Service Limit
275 N at 41 mm
61.8 lb at 1.61 in
Valve Springs-Valve Spring load - Exhaust -
Production Value
315-363 N at 41
mm
71-81.6 lb at 1.61
in
Valve Springs-Valve Spring Load - Intake -
Service Limit
306 N at 41 mm
68.8 lb at 1.61 in
Valve Springs-Valve Spring Load - Intake -
Production Value
315-363 N at 41
mm
71-81.6 lb at 1.61
in
Application
Type of Material
GM Part Number
United
States
Canada
Sealing Cup Plug
Locktite 272T or
Equivalent
12345493
10953488
Upper Oil Pan to Cylinder Block
Sealant
12378521
88901148
Flywheel Housing to Cylinder Block
Sealant
12378521
88901148
Engine Front Cover to Cylinder Block
Sealant
12378521
88901148
Lower Oil Pan to Upper Oil Pan
Sealant
12378521
88901148
Crankshaft Bearing Side Cap Bolts
Sealant
12346004
10953480
Intake Manifold to Cylinder Head
Sealant
12378521
88901148
Camshaft Bearing
Engine Oil
12345634
993297
Rocker Arm Shaft
Engine Oil
12345634
993297
Valve Bridge Cap
Engine Oil
12345634
993297
Valve Stem Seal
Engine Oil
12345634
993297
Valve Lifter
Engine Oil
12345634
993297
Piston Ring
Engine Oil
12345634
993297
Crankshaft Bearing
Engine Oil
12345634
993297
Connecting Rod Bearing
Engine Oil
12345634
993297
Thrust Bearing
Engine Oil
12345634
993297
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
CONNECTING ROD BEARINGS SELECTION SPECIFICATIONS
Connecting Rod Bearing Grade
CYLINDER HEAD GASKET SELECTION SPECIFICATIONS
Camshaft Bearing
Engine Oil
12345634
993297
Camshaft
Engine Oil
12345634
993297
Connecting Rod Small End Bushing
Engine Oil
12345634
993297
Push Rod
Engine Oil
12345634
993297
Crankshaft Bearing Cap Bolt
Molybdenum
Disulfide
1052948
992926
Lithium Grease
Lubricant
12346293
-
Parts Cleaner
Cleaner
12377981
10953463
Connecting
Rod Grade
(Stamped on
Connecting
Rod)
Use This
Bearing
Color
Bearing Thickness
Oil Clearance
Metric (mm) English (in) Metric (mm) English (in)
A
Green
2.007 - 2.013
0.0790 -
0.0793
0.037 - 0.076
0.0015 -
0.0030
B
Yellow
2.011 - 2.017
0.0792 -
0.0794
0.037 - 0.076
0.0015 -
0.0030
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 1: View Of Cylinder Head Gasket Selection Marks
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
1
Grade A
2
Grade B
3
Grade C
4
Block Over-Bored
5
Block Over-Bored and Deck Milled
Cylinder Head
Gasket Grade
Ti Max (Piston Projection)
Compressed Gasket Thickness
Metric (mm)
English (in)
Metric (mm)
English (in)
Grade A
0.223 -0.274
0.0088 -0.0108
0.90-1.00
0.0354-0.0394
Grade B
0.274-0.325
0.0108-0.0128
0.95-1.05
0.0374-0.0413
Grade C
0.325-0.376
0.0128-0.0148
1.00-1.10
0.0394-0.0433
Block Over-
Bored 0.010-
0.030 in (0.254-
0.762 mm)
0.223-0.376
0.0088-0.0148
1.00-1.10
0.0394-0.0433
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
CRANKSHAFT BEARING SELECTION SPECIFICATIONS
VALVE CLEARANCE ADJUSTMENT SPECIFICATIONS
THREAD REPAIR SPECIFICATIONS
Cylinder Head - Exhaust View
Block Over-
Bored 0.010-
0.030 in (0.254-
0.762 mm) and
Deck Milled
0.008 in (0.203
mm)
0.4257-0.5777
0.0168-0.0228
1.25-1.35
0.0492-0.0532
Cylinder Block
Grade
Crankshaft
Journal Grade
Identification
Bearing Color
Oil Clearance
Metric (mm)
English (in)
1
1
Black
0.041-0.068
0.0016-0.0027
1
2
Brown
0.039-0.065
0.0015-0.0026
2
1
Blue
0.043-0.070
0.0017-0.0028
2
2
Black
0.041-0.067
0.0016-0.0027
Cylinder
Adjust at No 1
Compression Stroke TDC
Adjust at No 1 Exhaust
Stroke TDC
Left Bank
Right Bank
Intake
Exhaust
Intake
Exhaust
-
1
X
X
-
-
2
-
-
X
X
-
-
3
X
-
-
X
4
-
-
-
X
X
-
5
X
-
-
X
6
-
X
-
-
X
-
7
-
X
X
-
8
-
-
X
X
-
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado