Holden / Chevrolet L98 6.0L V8 - Engine Specifications

GM L98 Engine Specifications - 6.0L LS V8

RPO L98 · 364 CID · 10.4:1 Compression

The GM L98 is a 6.0-litre Gen IV LS V8 engine produced from 2006 to 2010, fitted to a range of Holden vehicles including the VZ (SS Thunder), VE and VF Commodore, Caprice, and Statesman. Sharing its 101.6 mm bore and 92.0 mm stroke with the LS2, the L98 runs a 10.4:1 compression ratio and - unlike its siblings the L76 and L77 - does not feature Active Fuel Management (AFM). This makes the L98 a straightforward platform with no cylinder deactivation hardware to contend with. The L98 uses rectangular port cylinder heads and a drive-by-wire throttle body, and is a popular choice for performance builds. The factory specifications below cover block, crankshaft, cylinder head, valvetrain, piston, and lubrication system tolerances sourced from official GM service documentation.

GM L98 6.0L LS V8 Engine

Specification Metric Imperial
General
Engine Type V8
Displacement 6.0L 364 CID
RPO L98
Bore 101.618 mm - 101.636 mm 4.0007 in - 4.0017 in
Stroke 92.0 mm 3.622 in
Compression Ratio 10.4:1
Idle Speed RPM (AT) --
Idle Speed RPM (MT) --
Firing Order 1-8-7-2-6-5-4-3
Spark Plug Gap 1.02 mm 0.04 in
Block
Camshaft Bearing Bore Number 1 and 5 Diameter 59.58 mm - 59.63 mm 2.345 in - 2.347 in
Camshaft Bearing Bore Number 2 and 4 Diameter 59.08 mm - 59.13 mm 2.325 in - 2.327 in
Camshaft Bearing Bore Number 3 Diameter 58.58 mm - 58.63 mm 2.306 in - 2.308 in
Crankshaft Main Bearing Bore Diameter 69.871 mm - 69.889 mm 2.75 in - 2.751 in
Crankshaft Main Bearing Bore Out-of-Round 0.006 mm 0.0002 in
Cylinder Bore Diameter 101.618 mm - 101.636 mm 4.0007 in - 4.0017 in
Cylinder Head Deck Height Measuring from the Centre line of Crankshaft to the Deck Face 234.57 mm - 234.82 mm 9.235 in - 9.245 in
Cylinder Head Deck Surface Flatness Measured within a 152.4 mm (6.0 in) Area 0.11 mm 0.004 in
Cylinder Head Deck Surface Flatness Measuring the Overall Length of the Block Deck 0.22 mm 0.008 in
Valve Lifter Bore Diameter 21.417 mm - 21.443 mm 0.843 in - 0.844 in
Camshaft
Camshaft End Play 0.025 mm - 0.305 mm 0.001 in - 0.012 in
Camshaft Journal Diameter 54.99 mm - 55.04 mm 2.164 in - 2.166 in
Camshaft Journal Out-of-Round 0.025 mm 0.001 in
Camshaft Lobe Lift - Intake 7.78 mm 0.306 in
Camshaft Lobe Lift - Exhaust 7.77 mm 0.305 in
Camshaft Runout Measured at the Intermediate Journals 0.05 mm 0.002 in
Connecting Rod
Connecting Rod Bearing Clearance - Production 0.023 mm - 0.065 mm 0.0009 in - 0.0025 in
Connecting Rod Bearing Clearance - Service 0.023 mm - 0.076 mm 0.0009 in - 0.003 in
Connecting Rod Bore Diameter - Bearing End 56.505 mm - 56.525 mm 2.224 in - 2.225 in
Connecting Rod Bore Out-of-Round - Bearing End - Production 0.004 mm - 0.008 mm 0.00015 in - 0.0003 in
Connecting Rod Bore Out-of-Round - Bearing End - Service 0.004 mm - 0.008 mm 0.00015 in - 0.0003 in
Connecting Rod Side Clearance 0.11 mm - 0.51 mm 0.00433 in - 0.02 in
Crankshaft
Connecting Rod Journal Diameter - Production 53.318 mm - 53.338 mm 2.0991 in - 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 mm 0.00078 in
Crankshaft End Play 0.04 mm - 0.2 mm 0.0015 in - 0.0078 in
Crankshaft Main Bearing Clearance - Production 0.02 mm - 0.052 mm 0.0008 in - 0.0021 in
Crankshaft Main Bearing Clearance - Service 0.02 mm - 0.065 mm 0.0008 in - 0.0025 in
Crankshaft Main Journal Diameter - Production 64.992 mm - 65.008 mm 2.558 in - 2.559 in
Crankshaft Main Journal Diameter - Service 64.992 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 in
Crankshaft Thrust Surface - Production 26.14 mm - 26.22 mm 1.029 in - 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 mm 0.004 in
Surface Flatness - Exhaust Manifold Deck 0.13 mm 0.005 in
Surface Flatness - Intake Manifold Deck 0.08 mm 0.0031 in
Valve Guide Installed Height Measured from the Spring Seat Surface to the Top of the Guide 17.32 mm 0.682 in
Intake Manifold
Surface Flatness Measured at Gasket Sealing Surfaces and Measured Within a 200 mm (7.87 in) Area that Includes 2 Runner Port Openings 0.3 mm 0.118 in
Lubrication System
Oil Capacity - with Filter 8.2 litres 8.6 quarts
Oil Capacity - without Filter 7.7 litres 8.1 quarts
Oil Pressure - Minimum - Hot 90 kPa at 1,000 engine RPM
124 kPa at 2,000 engine RPM
165 kPa at 4,000 engine RPM		 13 psig at 1,000 engine RPM
18 psig at 2,000 engine RPM
24 psig at 4,000 engine RPM
Relief Valve Oil Pressure Measured at Oil Pressure Sensor Location 379 - 517 kPa Maximum 55 - 75 psig Maximum
Oil Pan
Front Cover Alignment - at Oil Pan Surface 0.0 mm - 0.5 mm 0.0 in - 0.02 in
Crankshaft Rear Oil Seal Housing Alignment - at Oil Pan Surface 0.0 mm - 0.5 mm 0.0 in - 0.02 in
Oil Pan Alignment - to Rear of Engine Block at Transmission Bell Housing Mounting Surface 0.0 mm - 0.1 mm 0.0 in - 0.004 in
Piston Rings
Piston Ring End Gap - First Compression Ring Measured in Cylinder Bore - Production 0.20 mm - 0.41 mm 0.008 in - 0.016 in
Piston Ring End Gap - First Compression Ring Measured in Cylinder Bore - Service 0.20 mm - 0.41 mm 0.008 in - 0.016 in
Piston Ring End Gap - Second Compression Ring Measured in Cylinder Bore - Production 0.37 mm - 0.69 mm 0.015 in - 0.027 in
Piston Ring End Gap - Second Compression Ring Measured in Cylinder Bore - Service 0.37 mm - 0.69 mm 0.015 in - 0.027 in
Piston Ring End Gap - Oil Control Ring Measured in Cylinder Bore - Production 0.22 mm - 0.79 mm 0.009 in - 0.031 in
Piston Ring End Gap - Oil Control Ring Measured in Cylinder Bore - Service 0.22 mm - 0.79 mm 0.009 in - 0.031 in
Piston Ring to Groove Clearance - First Compression Ring - Production 0.030 mm - 0.10 mm 0.0012 in - 0.0040 in
Piston Ring to Groove Clearance - First Compression Ring - Service 0.030 mm - 0.10 mm 0.0012 in - 0.0040 in
Piston Ring to Groove Clearance - Second Compression Ring - Production 0.035 mm - 0.078 mm 0.0014 in - 0.0031 in
Piston Ring to Groove Clearance - Second Compression Ring - Service 0.035 mm - 0.078 mm 0.0014 in - 0.0031 in
Piston Ring to Groove Clearance - Oil Control Ring - Production 0.013 mm - 0.201 mm 0.0005 in - 0.0079 in
Piston Ring to Groove Clearance - Oil Control Ring - Service 0.013 mm - 0.201 mm 0.0005 in - 0.0079 in
Pistons and Pins
Pin - Piston Pin Clearance to Piston Pin Bore - Production 0.002 mm - 0.01 mm 0.0008 in - 0.0004 in
Pin - Piston Pin Clearance to Piston Pin Bore - Service 0.002 mm - 0.015 mm 0.0008 in - 0.0006 in
Pin - Piston Pin Diameter 23.952 mm - 23.955 mm 0.943 in - 0.943 in
Pin - Piston Pin Fit in Connecting Rod Bore - Production 0.007 mm - 0.02 mm 0.00027 in - 0.00078 in
Pin - Piston Pin Fit in Connecting Rod Bore - Service 0.007 mm - 0.0022 mm 0.00027 in - 0.00086 in
Piston - Piston Diameter Measured Over Skirt Coating 101.611 mm - 101.642 mm 4.0 in - 4.001 in
Piston to Bore Clearance - Production -0.022 mm - 0.08 mm -0.0009 in - 0.0012 in
Piston to Bore Clearance Service Limit with Skirt Coating Worn Off 0.024 mm - 0.08 mm 0.00094 in - 0.0031 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 13.23 mm 0.52 in
Valves - Valve Lift - Exhaust 13.22 mm 0.52 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 - Seat Width - Intake 1.02 mm 0.04 in
Valves - Valve Stem Diameter - Production 7.955 mm - 7.976 mm 0.313 in - 0.314 in
Valves - Valve Stem Diameter - Service 7.95 mm 0.313 in
Valves - Valve Stem-to-Guide Clearance - Production - Intake 0.025 mm - 0.066 mm 0.001 in - 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
Rocker Arms - Valve Rocker Arm Ratio 1.70:1
Valve Springs - Valve Spring Free Length 52.9 mm 2.08 in
Valve Springs - Valve Spring Installed Height 45.75 mm 1.8 in
Valve Springs - Valve Spring Load - Closed 340 N at 45.75 mm 76 lb at 1.8 in
Valve Springs - Valve Spring Load - Open 980 N at 33.55 mm 220 lb at 1.32 in

All information sourced from official Holden/GM/Chevrolet documentation.