Engine Mechanical Specifications. Chevrolet Impala 2008

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2008 🢒 Impala 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General Data
Engine Type	60 degree V-6
Displacement	3.9L	238 cu in
RPO	LZG (E85)
VIN	3 (E85)
Bore	99 mm	3.90 in
Stroke	84 mm	3.31 in
Compression Ratio	9.8:1
Firing Order	123456
Spark Plug Gap	1.00 mm	0.040 in
Block
Camshaft Bearing Bore Diameter - Front and Rear	55.26-55.31 mm	2.175-2.177 in
Camshaft Bearing Bore Diameter - Middle #2, #3	54.75-54.80 mm	2.155-2.157 in
Crankshaft Main Bearing Bore Diameter	72.1535-72.0695 mm	2.840-2.841 in
Crankshaft Main Bearing Bore Out-of-Round	0.008 mm	0.00031 in
Cylinder Bore Diameter	99.000-99.018 mm	3.897-3.898 in
Cylinder Bore Out-of-Round - Diameter - Production	0.026 mm	0.0010 in
Cylinder Bore Out-of-Round - Diameter - Service	0.030 mm	0.0011 in
Cylinder Bore Taper - Production	0.026 mm	0.0010 in
Cylinder Bore Taper - Service	0.030 mm	0.0011 in
Cylinder Head Deck Height	224 mm	8.818 in
Cylinder Head Deck Surface Flatness	0.05 mm per 150 mm	0.0019 in per 5.905 in
Valve Lifter Bore Diameter	21.417-21.455 mm	0.843-0.844 in
Camshaft
Camshaft Bearing Inside Diameter	51.500-51.525 mm	2.028-2.029 in
Camshaft Journal Diameter	51.415-51.440 mm	2.024-2.025 in
Camshaft Journal Out-of-Round	0.006 mm	0.003 in
Camshaft Lobe Lift - Exhaust	6.787 mm	0.267 in
Camshaft Lobe Lift - Intake	6.406 mm	0.272 in
Camshaft Endplay	0.049-0.380 mm	0.002-0.015 in
Cooling System
Thermostat Full Open Temperature	195 degrees
Connecting Rod
Connecting Rod Bearing Clearance	0.018-0.062 mm	0.0007-0.0024 in
Connecting Rod Bore Diameter	60.322-60.338 mm	2.375-2.376 in
Connecting Rod Bore Out-of-Round	0.006 mm	0.00023 in
Connecting Rod Length - Center to Center	150 mm	5.9 in
Connecting Rod Side Clearance	0.200-0.241 mm	0.008-0.009 in
Crankshaft
Connecting Rod Journal Diameter	57.122-57.138 mm	2.248-2.249 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	21.92-22.08 mm	0.863-0.869 in
Crankshaft End Play	0.060-0.210 mm	0.0024-0.0083 in
Crankshaft Main Bearing Clearance - Except #3	0.019-0.064 mm	0.0008-0.0025 in
Crankshaft Main Bearing Clearance - #3 Thrust Bearing	0.032-0.077 mm	0.0012-0.0030 in
Crankshaft Main Journal Out-of-Round	0.005 mm	0.0002 in
Crankshaft Main Journal Taper	0.005 mm	0.0002 in
Crankshaft Rear Flange Runout	0.04 mm	0.0016 in
Cylinder Head
Combustion Chamber Depth - at Measurement Point	2.2 mm	0.087 in
Surface Finish - Maximum	2.8 RA
Surface Flatness - Block Deck	0.08 mm per 152 mm	0.003 in per 6 in
Surface Flatness - Exhaust Manifold Deck	0.1 mm	0.004 in
Surface Flatness - Intake Manifold Deck	0.1 mm	0.004 in
Valve Guide Bore - Exhaust	8.01 mm	0.315 in
Valve Guide Bore - Intake	8.01 mm	0.315 in
Valve Guide Installed Height	16.6 mm	0.654 in
Lubrication System
Oil Capacity - with Filter	3.8 liter	4.0 quarts
Oil Pressure - @ 1850 RPM	207-310 kPa	30-45 PSI
Oil Pressure - @ Idle with Warm Engine	185 kPa	26 PSI
Oil Pump
Gear Diameter	50.749-50.800 mm	1.997-1.999 in
Gear Pocket - Depth	26.274-26.332 mm	1.034-1.036 in
Gear Pocket - Diameter	50.902-50.952 mm	2.004-2.005 in
Gears Lash	0.094-0.195 mm	0.0037-0.0077 in
Relief Valve-to-Bore Clearance	0.038-0.089 mm	0.0015-0.0035 in
Pin
Piston Pin Clearance to Connecting Rod Bore - Press Fit	-0.004 to -0.021 mm	-0.0001 to -0.0008 in
Piston Pin Clearance to Piston Pin Bore	0.002-0.010 mm	0.00008-0.0004 in
Piston Pin Diameter	23.952-23.955 mm	0.942-0.943 in
Piston Pin Length	64.21-64.44 mm	2.57-2.53 in
Piston
Piston Diameter - Production	98.970-99.008 mm	3.896-3.897 in
Piston Diameter - Service Limit	98.950 mm	3.895 in
Piston Pin Bore Diameter	23.957-23.962 mm	0.943 in
Piston Ring Groove Width	1.22-1.24 mm	0.048-0.049 in
Piston to Bore Clearance - Production	-0.008 to +0.048 mm	-0.0003 to +0.0018 in
Piston to Bore Clearance - Service Limit - Maximum	0.080 mm	0.003 in
Piston Ring End Gap
First Compression Ring	0.15-0.30 mm	0.006-0.011 in
Second Compression Ring	0.25-0.45 mm	0.009-0.017 in
Oil Control Ring	0.15-0.65 mm	0.06-0.025 in
Piston Ring to Groove Clearance
First Compression Ring	0.03-0.065 mm	0.001-0.002 in
Second Compression Ring	0.02-0.055 mm	0.0007-0.002 in
Oil Control Ring	0.01 mm	0.004 in
Piston Ring Thickness
First Compression Ring	1.175-1.190 mm	0.046-0.047 in
Second Compression Ring	1.475-1.490 mm	0.058 in
Oil Control Ring - Maximum	2.50 mm	0.098 in
Valves
Valve Face Angle	45 degrees
Valve Seat Angle	46 degrees
Valve Seat Depth - Exhaust - From Deck Face	8.9-9.1 mm	0.350-0.358 in
Valve Seat Depth - Intake - From Deck Face	7.9-8.1 mm	0.311-0.318 in
Valve Seat Width - Exhaust	1.70-2.0 mm	0.067-0.079 in
Valve Seat Width - Intake	1.55-1.80 mm	0.061-0.071 in
Valve Stem-to-Guide Clearance	0.024-0.064 mm	0.0009-0.0025 in
Valve Lifters/Push Rods
Push Rod Length - Intake	147.51 mm	5.81 in
Push Rod Length - Exhaust	154.87 mm	6.10 in
Valve Springs
Valve Spring Free Length	52.88 mm	2.08 in
Valve Spring Installed Height	46.75 mm	1.84 in
Valve Spring Load - Closed	340±19 N 43.2 mm	76.4 lb 1.701 in
Valve Spring Load - Open	1023±44 N 32 mm	230 lb 1.260 in
Valve Spring Total Number of Coils	8.01