Engine Mechanical Specifications. GMC Truck TopKick C-Series (Conventional) C4/C5 2004

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2004 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Preface 🢒 Cautions and Notices 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General
Engine Type	V8
Displacement	8.1L	496 CID
RPO	L18
VIN - Light Duty	G
VIN - Medium Duty	E
Bore	107.95 mm	4.25 in
Stroke	111.0 mm	4.37 in
Compression Ratio	9.1:1
Firing Order	1-8-7-2-6-5-4-3
Spark Plug Gap	1.52 mm	0.06 in
Block
Crankshaft Main Bearing Bore Diameter	74.606-74.622 mm	2.9372-2.9379 in
Cylinder Bore Diameter - Production	107.95-107.968 mm	4.25-4.2507 in
Cylinder Bore Diameter - Service	107.94-107.99 mm	4.2496-4.2516 in
Cylinder Bore Out-of-Round - Production, Maximum Minus Minimum Bore Diameter	0.018 mm	0.0007 in
Cylinder Bore Out-of-Round - Service, Maximum Minus Minimum Bore Diameter	0.05 mm	0.002 in
Cylinder Bore Taper - Production	0.018 mm	0.0007 in
Cylinder Bore Taper - Service Thrust Axis	0.05 mm	0.002 in
Cylinder Bore Taper - Service Pin Axis	0.05 mm	0.002 in
Cylinder Head Deck Height - from Centerline of Crankshaft	259.875-260.125 mm	10.231-10.241 in
Cylinder Head Deck Surface Flatness - Entire Face	0.1 mm	0.004 in
Cylinder Head Deck Surface Flatness - Within 150 mm (6 in)	0.05 mm	0.002 in
Valve Lifter Bore Diameter	21.417-21.443 mm	0.843-0.844 in
Camshaft
Camshaft Bearing Inside Diameter	49.548-49.573 mm	1.9507-1.9517 in
Camshaft Journal Diameter	49.472-49.522 mm	1.9477-1.9497 in
Camshaft Lobe Lift - Exhaust	6.973-7.075 mm	0.2745-0.2785 in
Camshaft Lobe Lift - Intake	6.924-7.026 mm	0.2726-0.2766 in
Camshaft Runout - Production	0.051 mm	0.002 in
Camshaft Runout - Service	0.076 mm	0.003 in
Connecting Rod
Connecting Rod Bearing Clearance - Production	0.033-0.068 mm	0.0013-0.0027 in
Connecting Rod Bearing Clearance - Service	0.033-0.081 mm	0.0013-0.0032 in
Connecting Rod Side Clearance	0.384-0.686 mm	0.0151-0.027 in
Crankshaft
Connecting Rod Journal Diameter	55.854-55.87 mm	2.199-2.1996 in
Connecting Rod Journal Out-of-Round - Production	0.0102 mm	0.0004 in
Connecting Rod Journal Taper - Production	0.0102 mm	0.0004 in
Crankshaft End Play	0.127-0.35 mm	0.005-0.0138 in
Crankshaft Main Bearing Clearance - #1, #2, #3, #4 Production	0.022-0.057 mm	0.0008-0.0022 in
Crankshaft Main Bearing Clearance - #5 Production	0.034-0.069 mm	0.0013-0.0027 in
Crankshaft Main Bearing Clearance - #1, #2, #3, #4 Service	0.022-0.089 mm	0.0008-0.0035 in
Crankshaft Main Bearing Clearance - #5 Service Limit	0.035-0.102 mm	0.0014-0.004 in
Crankshaft Main Journal Diameter	69.805-69.822 mm	2.7482-2.7489 in
Crankshaft Main Journal Out-of-Round - Production	0.0102 mm	0.0004 in
Crankshaft Main Journal Taper - Production	0.0102 mm	0.0004 in
Crankshaft Runout - Production	0.05 mm	0.002 in
Crankshaft Runout - Service	0.065 mm	0.0026 in
Cylinder Head
Cylinder Head Height/Thickness	259.875-260.125 mm	10.231-10.241 in
Surface Flatness - Block Deck	0.05 mm	0.002 in
Surface Flatness - Exhaust Manifold Deck	0.102 mm	0.004 in
Surface Flatness - Intake Manifold Deck	0.08 mm	0.003 in
Exhaust Manifold
Surface Flatness	0.254 mm	0.01 in
Lubrication System
Oil Capacity - First Design Oil Pan - Without Filter	5.7L	6.0 Qts
Oil Capacity - First Design Oil Pan - With Filter	6.15L	6.5 Qts
Oil Capacity - Second Design Oil Pan - Without Filter	8.5L	9.5 Qts
Oil Capacity - Second Design Oil Pan - With Filter	9.4L	10.0 Qts
Oil Pressure - Minimum	34 kPa @ 1,000 RPM	5 psi @ 1,000 RPM
Oil Pressure - Minimum	69 kPa @ 2,000 RPM	10 psi @ 2,000 RPM
Piston Rings
Piston Ring End Gap
First Compression Ring - Production	0.3-0.45 mm	0.012-0.018 in
First Compression Ring - Service	0.45-0.675 mm	0.018-0.027 in
Second Compression Ring - Production	0.45-0.65 mm	0.017-0.025 in
Second Compression Ring - Service	0.675-0.975 mm	0.026-0.039 in
Oil Control Ring - Production	0.249-0.759 mm	0.0098-0.0299 in
Oil Control Ring - Service	0.373-1.138 mm	0.015-0.045 in
Piston Ring-to-Groove Clearance
First Compression Ring	0.031-0.074 mm	0.0012-0.0029 in
Second Compression Ring	0.031-0.074 mm	0.0012-0.0029 in
Oil Control Ring	0.051-0.203 mm	0.002-0.008 in
Piston and Pins
Piston
Piston Diameter	Not Measurable	Not Measurable
Piston-to-Bore Clearance	Interference Fit	Interference Fit
Pin
Pin-Piston Pin Fit in Connecting Rod Bore-Production	0.010-0.023 mm	0.0004-0.0009 in
Pin-Piston Pin Fit in Connecting Rod Bore-Service	0.010-0.023 mm	0.0004-0.0009 in
Pin-Piston Pin Clearance-to-Piston Pin Bore-Production	0.003-0.011 mm	0.00019-0.00043 in
Pin-Piston Pin Clearance-to-Piston Pin Bore-Service	0.003-0.011 mm	0.00019-0.00043 in
Pin-Piston Pin Diameter	26.416-26.419 mm	1.039-1.040 in
Valve System
Valves
Valve Face Angle - Exhaust	45 degrees
Valve Face Angle - Intake	45 degrees
Valve Head Diameter - Exhaust	43.69 mm	1.72 in
Valve Head Diameter - Intake	55.63 mm	2.19 in
Valve Lash - Exhaust	Net Lash	Net Lash
Valve Lash - Intake	Net Lash	Net Lash
Valve Seat Angle - Exhaust	46 degrees
Valve Seat Angle - Intake	46 degrees
Valve Seat Runout - Exhaust	0.05 mm	0.002 in
Valve Seat Runout - Intake	0.05 mm	0.002 in
Valve Seat Width - Exhaust	1.651-2.159 mm	0.060-0.095 in
Valve Seat Width - Intake	0.8-1.2 mm	0.03-0.06 in
Valve Stem Diameter - Exhaust	9.431-9.449 mm	0.3713-0.372 in
Valve Stem Diameter - Intake	9.436-9.454 mm	0.3715-0.3722 in
Valve Stem-to-Guide Clearance - Exhaust - Production	0.03-0.079 mm	0.0012-0.0031 in
Valve Stem-to-Guide Clearance - Intake - Production	0.025-0.074 mm	0.001-0.0029 in
Valve Stem-to-Guide Clearance - Exhaust - Service	0.03-0.104 mm	0.0012-0.0041 in
Valve Stem-to-Guide Clearance - Intake - Service	0.025-0.099 mm	0.001-0.0039 in
Rocker Arms
Valve Rocker Arm Ratio	1.7:1
Valve Springs
Valve Spring Free Length	56.35 mm	2.218 in
Valve Spring Installed Height	45.92-46.69 mm	1.808-1.838 in
Valve Spring Load - Closed	381-419 N at 45.92 mm	86-94 lb at 1.808 in
Valve Spring Load - Open	964-1056 N at 33.99 mm	216-236 lb at 1.338 in