Cylinder Head Assembly: Specifications

2009 Chevrolet Impala V6-3.5LSECTION Specifications
CYLINDER HEAD BOLTS

Left - Right:





Cylinder Head Bolt
First pass 60 Nm (44 lb ft)
Final pass 140 degrees

CYLINDER HEAD BOLT RE-USABILITY

Notice: This component uses torque-to-yield bolts. When servicing this component do not reuse the bolts, New torque-to-yield bolts must be installed. Reusing used torque-to-yield bolts will not provide proper bolt torque and clamp load. Failure to install NEW torque-to-yield bolts may lead to engine damage.

CYLINDER HEAD SURFACE VARIATION

Surface finish
Maximum 2.8 RA

Surface flatness
Block Deck 0.08 mm Per 152 mmm (.003 in) Per 6 in
Exhaust Manifold Deck 0.1 mm (0.004 in)
Intake Manifold Deck 0.1 mm (0.004 in)

CYLINDER BLOCK

Cylinder Head Deck Surface Flatness 0.05 mm per 152 mm (0.0019) in per 6 in

INTAKE MANIFOLD





Lower Intake Manifold Bolt - Center
First Pass 7 N.m (62 lb in)
Final Pass 13 N.m (115 lb in)

Lower Intake Manifold Bolt - Corner
First Pass 7 N.m (62 lb in)
Final Pass 25 N.m (18 lb ft)

Upper Intake Manifold Bolt/Stud 25 Nm (18 lb ft)

CAMSHAFT BEARING CAP

Camshaft Position Actuator Assembly Bolt 16 Nm (12 lb ft)
Camshaft Position Actuator Magnet Bolt 10 Nm (89 lb in)
Camshaft Position Sensor Bolt 10 Nm (89 lb in)
Camshaft Thrust Plate Screw 10 Nm (89 lb in)

EXHAUST MANIFOLD (LEFT AND RIGHT)








Exhaust manifold bolts 20 Nm (15 lb ft)

CAMSHAFT GEAR/SPROCKET

Camshaft Sprocket bolts 16 Nm (12 lb ft)
RENDER: 1.0x

NO RELATED

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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.