Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008TAHOE 4WD V8-6.0L HYBRIDREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLY
2008 Chevrolet Tahoe 4WD V8-6.0L Hybrid
Cylinder Head Assembly
2008 Chevrolet Tahoe 4WD V8-6.0L HybridSECTION Cylinder Head Assembly
Cylinder Head
Cylinder Head Height/Thickness - Measured from the Cylinder Head Deck to the Valve Rocker Arm Cover Seal Surface 120.2 mm (4.732 in)
Surface Flatness - Block Deck - Measured Within a 152.4 mm (6.0 in) Area 0.08 mm (0.003 in)
Surface Flatness - Block Deck - Measuring the Overall Length of the Cylinder Head 0.1 mm (0.004 in)
Cylinder Head Bolt Re-Usability
Do not reuse the cylinder head bolts. Install NEW cylinder head bolts during assembly.
Cylinder Head Bolts
Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 N.m (22 lb ft).
Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using J 45059 .
Tighten the M11 cylinder head bolts (1-10) a final pass to 70 degrees in sequence using J 45059.
Tighten the M8 cylinder head bolts (11-15) to 30 N.m (22 lb ft).
Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.
Exhaust Manifold Bolts - First Pass 15 N.m (11 lb ft)
Exhaust Manifold Bolts - Final Pass 20 N.m (15 lb ft)
Intake Manifold
Tighten the bolts a first pass in the sequence shown to 5 N.m (44 lb in).
Tighten the bolts a final pass in the sequence shown to 10 N.m (89 lb in).
Intake Manifold (LFA)
Tighten the bolts a first pass in the sequence shown to 5 N.m (44 lb in).
Tighten the bolts a final pass in the sequence shown to 10 N.m (89 lb in).
Cylinder Head Height/Thickness - Measured from the Cylinder Head Deck to the Valve Rocker Arm Cover Seal Surface 120.2 mm (4.732 in)
Surface Flatness - Block Deck - Measured Within a 152.4 mm (6.0 in) Area 0.08 mm (0.003 in)
Surface Flatness - Block Deck - Measuring the Overall Length of the Cylinder Head 0.1 mm (0.004 in)
Cylinder Head Bolt Re-Usability
Do not reuse the cylinder head bolts. Install NEW cylinder head bolts during assembly.
Cylinder Head Bolts
Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 N.m (22 lb ft).
Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using J 45059 .
Tighten the M11 cylinder head bolts (1-10) a final pass to 70 degrees in sequence using J 45059.
Tighten the M8 cylinder head bolts (11-15) to 30 N.m (22 lb ft).
Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.
Exhaust Manifold Bolts - First Pass 15 N.m (11 lb ft)
Exhaust Manifold Bolts - Final Pass 20 N.m (15 lb ft)
Intake Manifold
Tighten the bolts a first pass in the sequence shown to 5 N.m (44 lb in).
Tighten the bolts a final pass in the sequence shown to 10 N.m (89 lb in).
Intake Manifold (LFA)
Tighten the bolts a first pass in the sequence shown to 5 N.m (44 lb in).
Tighten the bolts a final pass in the sequence shown to 10 N.m (89 lb in).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.