Engine Mechanical Specifications

WARNING: This page is about a different car, the 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Application		Specification
Application		Metric	English
General Data
Engine Type	60° V-6
Displacement	3.1L	191 cu in
RPO	LG8
VIN	J
Bore	89 mm	3.50 in
Stroke	84 mm	3.31 in
Compression Ratio	9.6:1	-
Firing Order	1-2-3-4-5-6	-
Spark Plug Gap	1.52 mm	0.60 in
Block
Camshaft Bearing Bore Diameter - ID	47.516-47.541 mm	1.871-1.872 in
Camshaft Bearing Bore Diameter - Front and Rear	51.03-51.08 mm	2.009-2.011 in
Camshaft Bearing Bore Diameter - Middle #2, #3	50.77-50.82 mm	1.999-2.001 in
Crankshaft Main Bearing Bore Diameter	72.1535-72.1695 mm	2.8407-2.8413 in
Crankshaft Main Bearing Bore Out-of-Round	0.008 mm	0.0003 in
Cylinder Bore Diameter - Production	89.016-89.034 mm	3.5046-3.5053 in
Cylinder Bore Diameter - Service	89.016-89.042 mm	3.5046-3.5056 in
Cylinder Bore Out-of-Round - Diametral - Production	0.020 mm	0.0008 in
Cylinder Bore Out-of-Round - Diametral - Service	0.025 mm	0.001 in
Cylinder Bore Taper - Production	0.020 mm	0.0008 in
Cylinder Bore Taper - Service	0.025 mm	0.001 in
Cylinder Head Deck Height	224 mm	8.819 in
Cylinder Head Deck Surface Flatness	0.05 mm per 152 mm	0.002 in per 6 in
Valve Lifter Bore Diameter	21.417-21.455 mm	0.843-0.845 in
Camshaft
Camshaft Bearing Inside Diameter	47.516-47.541 mm	1.871-1.872 in
Camshaft Journal Diameter	47.443-47.468 mm	1.868-1.869 in
Camshaft Journal Out-of-Round	0.003 mm	0.00012 in
Camshaft Journal to Bearing Clearance	0.048-0.098 mm	0.002-0.004 in
Camshaft Lobe Lift - Exhaust	6.9263 mm	0.2727 in
Camshaft Lobe Lift - Intake	6.9263 mm	0.2727 in
Camshaft Runout	0.050 mm	0.002 in
Cooling System
Capacity @ Engine RPM	12.4 liters	13.1 quarts
Thermostat Full Open Temperature	195 degrees
Connecting Rod
Connecting Rod Bearing Clearance	0.18-0.062 mm	0.0007-0.017 in
Connecting Rod Bore Diameter	53.962-53.978 mm	2.124-2.125 in
Connecting Rod Bore Out-of-Round	0.008 mm	0.00031 in
Connecting Rod Length - Center to Center	144.75-144.81 mm	5.69-5.70 in
Connecting Rod Side Clearance	0.25-0.37 mm	0.010-0.015 in
Crankshaft
Connecting Rod Journal Diameter	50.768-50.784 mm	1.9987-1.9994 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	8.62-8.69 in
Crankshaft End Play	0.060-0.210 mm	0.0024-0.0083 in
Crankshaft Main Bearing Journal Width - #1	29.5 mm	1.161 in
Crankshaft Main Bearing Journal Width - #2	24.0 mm	0.945 in
Crankshaft Main Bearing Jounal Width - #3	24.04 mm	0.946 in
Crankshaft Main Bearing Journal Width - #4	35.8 mm	1.409 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 Diameter	67.239-67.257 mm	2.6473-2.6483 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
Crankshaft Reluctor Ring Runout - Max	0.34 mm	0.0134 in
Crankshaft Runout	0.025 mm	0.0010 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	4.3 liters	4.5 quarts
Oil Capacity - without Filter	3.8 liters	4.0 quarts
Oil Pressure - @ 1850 RPM	414 kPa	60 psi
Oil Pump
Gear Diameter	38.05-38.10 mm	1.498-1.500 in
Gear Pocket - Depth	30.52-30.58 mm	1.202-1.204 in
Gear Pocket - Diameter	38.176-38.226 mm	1.503-1.505 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
Piston Ring End Gap	-	-
First Compression Ring	0.15-0.36 mm	0.006-0.014 in
Second Compression Ring	0.5-0.71 mm	0.0197-0.0280 in
Oil Control Ring	0.25-1.02 mm	0.009-0.040 in
Piston Ring to Groove Clearance
First Compression Ring	0.04-0.086 mm	0.002-0.0033 in
Second Compression Ring	0.04-0.08 mm	0.002-0.0035 in
Oil Control Ring	0.07-0.095 mm	0.0028-0.0037 in
Piston Ring Thickness	-	-
First Compression Ring	1.164-1.190 mm	0.046-0.047 in
Second Compression Ring	1.470-1.490 mm	0.057-0.058 in
Oil Control Ring - Maximum	2.960 mm	0.116 in
Pistons	-	-
Piston Diameter - New	88.986-89.024 mm	3.503-3.504 in
Piston Ring Groove Width - Top	1.23-1.25 mm	0.048-0.049 in
Piston Ring Groove Width - Second	1.53-1.55 mm	0.060-0.061 in
Piston Ring Groove Width - Third	3.03-3.05 mm	0.119-0.120 in
Piston to Bore Clearance	-0.008--0.048 mm	-0.0003--0.0018 in
Rocker Arms
Valve Rocker Arm Ratio	1.6:1
Valves
Valve Face Angle	45 degrees
Valve Face Runout	0.050 mm	0.002 in
Valve Seat Angle	46 degrees
Valve Seat Depth - Intake	7.9-8.1 mm	0.311-0.318 in
Valve Seat Depth - Exhaust	8.9-9.1 mm	0.350-0.358 in
Valve Seat Runout	0.037 mm	0.0015 in
Valve Seat Width - Intake	1.55-1.80 mm	0.061-0.071 in
Valve Seat Width - Exhaust	1.70-2.0 mm	0.067-0.079 in
Valve Stem-to-Guide Clearance	0.026-0.068 mm	0.0010-0.0027 in
Valve Stem Diameter - Intake	7.967-7.980 mm	0.3137-0.3142 in
Valve Stem Diameter	7.944-7.965 mm	0.3128-0.3136 in
Valve Lifters/Push Rods
Push Rod Length - Intake	146.0 mm	5.75 in
Push Rod Length - Exhaust	152.5 mm	6.0 in
Valve Lifter Diameter	21.387-21.405 mm	0.8420-0.3136 in
Valve Lifter-to-Bore Clearance	0.012-0.068 mm	0.0005-0.0027 in
Valve Springs
Valve Spring Free Length	48.5 mm	1.89 in
Valve Spring Installed Height	43.2 mm	1.701 in
Valve Spring Load - Closed	320 N @ 43.2 mm	75 lb @ 1.701 in
Valve Spring Load - Open	1036 N @ 32 mm	230 lb @ 1.260 in
Valve Spring Total Number of Coils	6.55