Engine Mechanical Specifications - LS6

2004 Oldsmobile Bravada AWDSECTION Engine Mechanical Specifications - LS6
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
ENGINE MECHANICAL SPECIFICATIONS - LS6

Application Specification
Metric English
General
  Engine Type V 8
  Displacement 5.7 L - 5665 cc 346 CID
  RPO LS6
  VIN S
  Bore 99.0-99.018 mm 3.897-3.898 in
  Stroke 92.0 mm 3.622 in
  Compression Ratio 10.5:1
  Firing Order 1-8-7-2-6-5-4-3
  Spark Plug Gap 1.524 mm 0.06 in
Block
  Camshaft Bearing Bore Diameter 55.063-55.088 mm 2.168-2.169 in
  Crankshaft Main Bearing Bore Diameter 69.871-69.889 mm 2.75-2.751 in
  Crankshaft Main Bearing Bore Out-of-Round 0.005 mm 0.0002 in
  Cylinder Bore Diameter 99.0-99.018 mm 3.897-3.898 in
  Cylinder Bore Taper - Thrust Side 0.018 mm 0.0007 in
  Cylinder Head Deck Height - Measuring from the Centerline of Crankshaft to the Deck Face 234.57-234.82 mm 9.235-9245 in
  Cylinder Head Deck Surface Flatness - Measured Within a 152.4 mm (6.0 in) Area 0.08 mm 0.003 in
  Cylinder Head Deck Surface Flatness - Measuring the Overall Length of the Block Deck 0.22 mm 0.008
  Valve Litter Bore Diameter 21.417-21.443 mm 0.843-0.844 in
Camshaft
  Camshaft End Play 0.025-0.305 mm 0.001-0.012 in
  Camshaft Journal Diameter 54.99-55.04 mm 2.164-2.166 in
  Camshaft Journal Out-of-Round 0.025 mm 0.001 in
  Camshaft Lobe Lift - Exhaust 8.19 mm 0.322 in
  Camshaft Lobe Lift - Intake 8.24 mm 0.324 in
  Camshaft Runout - Measured at the Intermediate Journals 0.05 mm 0.002 in
Connecting Rod
  Connecting Rod Bearing Clearance - Production 0.023-0.065 mm 0.0009-0.0025 in
  Connecting Rod Bearing Clearance - Service 0.023-0.076 mm 0.0009-0.003 in
  Connecting Rod Bore Diameter - Bearing End 56.505-56.525 mm 2.224-2.225 in
  Connecting Rod Bore Out-of-Round - Bearing End 0.006 mm 0.00023 in
  Connecting Rod Bore Out-of-Round - Bearing End - Service 0.006 mm 0.00023 in
  Connecting Rod Side Clearance 0.11-0.51 mm 0.00433-0.02 in
Crankshaft
  Connecting Rod Journal Diameter - Production 53.318-53.338 mm 2.0991-2.0999 in
  Connecting Rod Journal Diameter - Service 53.308 mm 2.0987 in
  Connecting Rod Journal Out-of-Round - Production 0.005 mm 0.0002 in
  Connecting Rod Journal Out-of-Round - Service 0.01 mm 0.0004 in
  Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Production 0.005 mm 0.0002 in
  Connecting Rod Journal Taper - Maximum for 1/2 of Journal Length - Service 0.02 0.0078 in
  Crankshaft End Play 0.04-0.2 mm 0.0015-0.0078 in
  Crankshaft Main Bearing Clearance - Production 0.02-0.052 mm 0.0006-0.0021 in
  Crankshaft Main Bearing Clearance - Service 0.02-0.065 mm 0.0008-0.0025 in
  Crankshaft Main Journal Diameter - Production 64.993-65.007 mm 2.558-2.559 in
  Crankshaft Main Journal Diameter - Service 64.993 mm 2.558 in
  Crankshaft Main Journal Out-of-Round - Production 0.003 mm 0.000118 in
  Crankshaft Main Journal Out-of-Round - Service 0.008 mm 0.0003 in
  Crankshaft Main Journal Taper - Production 0.01 mm 0.0004 in
  Crankshaft Main Journal Taper - Service 0.02 mm 0.00078 in
  Crankshaft Rear Flange Runout 0.05 mm 0.002 in
  Crankshaft Reluctor Ring Runout - Measured 1.0 mm (0.04 in) Below Tooth Diameter 0.7 mm 0.028
  Crankshaft Thrust Surface - Production 26.14-26.22 mm 1.029-1.0315 in
  Crankshaft Thrust Surface - Service 26.22 mm 1.0315 in
  Crankshaft Thrust Surface Runout 0.025 mm 0.001 in
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 0.004 in
  Surface Flatness - Exhaust Manifold Deck 0.22 mm 0.008 in
  Surface Flatness - Intake Manifold Deck 0.22 mm 0.008 in
Intake Manifold
  Surface Flatness - Measured at Gasket Sealing Surfaces 0.5 mm 0.02 in
Lubrication System
  Oil Capacity - with Filter 6.151 Liters 6.5 Quarts
  Oil Capacity - without Filter 5.678 Liters 6.0 Quarts
  Oil Pressure - Minimum - Hot 41 kPa at 1,000 engine RPM 6 psig at 1,000 engine RPM
124 kPa at 2,000 engine RPM 18 psig at 2,000 engine RPM
165 kPa at 4,000 engine RPM 24 psig at 4,000 engine RPM
Oil Pan
  Front Cover Alignment - at Oil Pan Surface 0.0-0.5 mm 0.0-0.02 in
  Rear Cover Alignment - at Oil Pan Surface 0.0-0.5 mm 0.0-0.02 in
  Oil Pan Alignment - to Rear of Engine Block at Transmission Bellhousing Mounting Surface 0.0-0.25 mm 0.0-0.01 in
Piston Rings
  Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Prodution 0.23-0.44 mm 0.009-0.017 in
  Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore 0.23-0.5 mm 0.009-0.0196 in
  Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production 0.44-0.7 mm 0.017-0.027 in
  Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore 0.44-0.76 mm 0.0173-0.03 in
  Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production 0.18-0.75 mm 0.007-0.029 in
  Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service 0.18-0.81 mm 0.007-0.032 in
  Piston Ring to Groove Clearance - First Compression Ring - Production 0.04-0.086 mm 0.00157-0.0033 in
  Piston Ring to Groove Clearance - First Compression Ring - Service 0.04-0.068 mm 0.00157-0.0033 in
  Piston Ring to Groove Clearance - Second Compression Ring - Production 0.05-0.088 mm 0.002-0.0034 in
  Piston Ring to Groove Clearance - Second Compression Ring - Service 0.05-0.088 mm 0.002-0.0034 in
  Piston Ring to Groove Clearance - Oil Control Ring - Production -0.008 to +0.0176 mm -0.0003 to +0.0069 in
  Piston Ring to Groove Clearance - Oil Control Ring - Service -0.008 to +0.0176 mm -0.0003 to +0.0069 in
Pistons and Pins
  Piston - Piston Diameter - Non Coated Skirt - at Size Point 98.969-98.987 mm 3.8964-3.8997 in
  Piston - Piston Diameter - Measured Over Coating - at Size Point 99.989-99.027 mm 3.897-3.899 in
  Piston - Piston to Bore Clearance - Non Coated Skirt - Production 0.013-0.049 mm 0.0005-0.0019 in
  Piston - Piston to Bore Clearance - Non Coated Skirt - Service 0.013-0.074 mm 0.0005-0.0029 in
  Piston - Piston to Bore Clearance - Coated Skirt - Production -0.027 to +0.029 mm -0.001 to +0.0011 in
  Piston - Piston to Bore Clearance - Coating Worn Off - Service 0.013-0.074 mm 0.0005-0.0029 in
  Pin - Piston Pin Fit in Connecting Rod Bore 0.02-0.043 mm - Interference 0.00078-0.00169 in - Interference
  Pin - Piston Pin Clearance to Piston Pin Bore - Production 0.01-0.02 mm 0.0004-0.00078 in
  Pin - Piston Pin Clearance to Piston Pin Bore - Service 0.01-0.022 mm 0.0004-0.00086 in
  Pin - Piston Pin Diameter 23.997-24.0 mm 0.9447-0.9448 in
Valve System
  Valves - Valve Face Angle 45 degrees
  Valves - Valve Face Width 1.25 mm 0.05 in
Valves - Valve Lash Net Lash - No Adjustment
Valves - Valve Lift - Intake 14.02 mm 0.552 in
Valves - Valve Lift - Exhaust 13.92 mm 0.548 in
Valves - Valve Seat Angle 46 degrees
Valves - Valve Seat Runout 0.05 mm 0.002 in
Valves - Valve Seat Width - Exhaust 1.78 mm 0.07 in
Valves - Valve Seat Width - Intake 1.02 mm 0.04 in
Valves - Valve Stem Diameter - Production 7.955-7.976 mm 0.313-0.314 in
Valves - Valve Stem Diameter - Service 7.96 mm 0.314 in
Valves - Valve Stem-to-Guide Clearance - Production - Intake 0.025-0.066 mm 0.001-0.0026 in
Valves Valve Stem-to-Guide Clearance - Service - Intake 0.093 mm 0.0037 in
Valves - Valve Stem-to-Guide Clearance - Production - Exhaust 0.025-0.066 mm 0.001-0.0026 in
Valves - Valve Stem-to-Guide Clearance - Service - Exhaust 0.093 mm 0.0037 in
Valve Rocker Arm - Valve Rocker Arm Ratio 1.70:1
Valve Springs - Valve Spring Free Length 53.4 mm 2.1 in
Valve Springs - Valve Spring Installed Height 45.75 mm 1.8 in
Valve Springs - Valve Spring Load - Closed 400 N at 45.75 mm 90 lb at 1.8 in
Valve Springs - Valve Spring Load- Open 1310 N at 31.75 mm 294 lb at 1.25 in
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

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.