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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 05-24-2008, 03:51 PM   #1
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Default lq4 specs

I work at a dealer and i found this in our service information site just thought some one might could use this.


Engine Mechanical Specifications (LQ4 VIN U)


Engine Type
V8

Displacement
6.0L
364 CID

RPO
LQ4

VIN
U

Bore
101.618-101.636 mm
4.0007-4.0014 in

Stroke
92.0 mm
3.622 in

Compression Ratio
9.41:1

Firing Order
1-8-7-2-6-5-4-3

Spark Plug Gap

AC Delco Type 41-974
1.524 mm
0.06 in

AC Delco Type 41-985
1.016 mm
0.04 in

Block

Camshaft Bearing Bore 1 and 5 Diameter - First Design
59.12-59.17 mm
2.327-2.329 in

Camshaft Bearing Bore 2 and 4 Diameter - First Design
58.87-58.92 mm
2.317-2.319 in

Camshaft Bearing Bore 3 Diameter - First Design
58.62-58.67 mm
2.307-2.309 in

Camshaft Bearing Bore 1 and 5 Diameter - Second Design
59.62-59.67 mm
2.347-2.349 in

Camshaft Bearing Bore 2 and 4 Diameter - Second Design
59.12-59.17 mm
2.327-2.329 in

Camshaft Bearing Bore 3 Diameter - Second Design
58.62-58.67 mm
2.307-2.309 in

Crankshaft Main Bearing Bore Diameter
69.871-69.889 mm
2.75-2.751 in

Crankshaft Main Bearing Bore Out-of-Round
0.006 mm
0.0002 in

Cylinder Bore Diameter
101.618-101.636 mm
4.0007-4.0017 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
9.235-9.245 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
21.417-21.443 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
7.13 mm
0.281 in

Camshaft Lobe Lift - Intake
6.96 mm
0.274 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 - Production
0.006 mm
0.0002 in

Connecting Rod Bore Out-of-Round - Bearing End - Service
0.006 mm
0.0002 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 mm
0.00078 in

Crankshaft End Play
0.04-0.2 mm
0.0015-0.0078 in

Crankshaft Main Bearing Clearance - Production
0.02-0.052 mm
0.0008-0.0021 in

Crankshaft Main Bearing Clearance - Service
0.02-0.065 mm
0.0008-0.0025 in

Crankshaft Main Journal Diameter - Production
64.992-65.008 mm
2.558-2.559 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
26.14-26.22 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 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 Two Runner Port Openings
0.3 mm
0.118 in

Lubrication System

Oil Capacity - with Filter
5.68 liters
6.0 quarts

Oil Capacity - without Filter
4.73 liters
5.0 quarts

Oil Pressure - Minimum - Hot
41 kPa at 1,000 engine RPM

124 kPa at 2,000 engine RPM

165 kPa at 4,000 engine RPM
6 psig at 1,000 engine RPM

18 psig at 2,000 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 Bell Housing 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 - Production
0.31-0.52 mm
0.012-0.02 in

Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service
0.31-0.59 mm
0.0122-0.023 in

Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production
0.51-0.77 mm
0.02-0.03 in

Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service
0.51-0.84 mm
0.02-0.033 in

Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production
0.31-0.87 mm
0.0122-0.034 in

Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service
0.31-0.94 mm
0.0122-0.037 in

Piston Ring to Groove Clearance - First Compression Ring - Production
0.04-0.08 mm
0.00157-0.0031 in

Piston Ring to Groove Clearance - First Compression Ring - Service
0.04-0.08 mm
0.00157-0.0031 in

Piston Ring to Groove Clearance - Second Compression Ring - Production
0.039-0.079 mm
0.0015-0.0031 in

Piston Ring to Groove Clearance - Second Compression Ring - Service
0.039-0.079 mm
0.0015-0.0031 in

Piston Ring to Groove Clearance - Oil Control Ring - Production
0.015-0.199 mm
0.0006-0.0078 in

Piston Ring to Groove Clearance - Oil Control Ring - Service
0.015-0.199 mm
0.0006-0.0078 in

Pistons and Pins

Piston - Piston Diameter - Measured Over Skirt Coating
101.606-101.640 mm
4.0002-4.0016 in

Piston - Piston to Bore Clearance - Production
0.022-0.03 mm - interference
0.0009-0.0012 in - interference

Piston - Piston to Bore Clearance - Service Limit with Skirt Coating Worn Off
0.07 mm
0.0028 in

Pin - First Design Press Fit Pin Fit in Connecting Rod Bore
0.02-0.043 mm - Interference
0.00078-0.00169 in - Interference

Pin - First Design Press Fit Pin Clearance to Piston Pin Bore - Production
0.01-0.02 mm
0.0004-0.00078 in

Pin - First Design Press Fit Pin Clearance to Piston Pin Bore - Service
0.01-0.022 mm
0.0004-0.00086 in

Pin - First Design Press Fit Pin Diameter
23.997-24.0 mm
0.9447-0.9448 in

Pin - Second Design Full Floating Pin Fit in Connecting Rod Bore - Production
0.007-0.02 mm
0.00027-0.00078 in

Pin - Second Design Full Floating Pin Fit in Connecting Rod Bore - Service
0.007-0.022 mm
0.00027-0.00086 in

Pin - Second Design Full Floating Pin Clearance to Piston Pin Bore - Production
0.002-0.01 mm
0.00008-0.0004 in

Pin - Second Design Full Floating Pin Clearance to Piston Pin Bore - Service
0.002-0.015 mm
0.00008-0.0006 in

Pin - Second Design Full Floating Pin Diameter
23.952-23.955 mm
0.943-0.943 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
11.79 mm
0.464 in

Valves - Valve Lift - Exhaust
12.16 mm
0.479 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
7.95 mm
0.313 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

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
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Old 05-24-2008, 10:27 PM   #2
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Good Info! Thanks!
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Old 05-24-2008, 10:40 PM   #3
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Awesome info!
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Old 09-27-2010, 07:06 PM   #4
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Have no idea how long Ive looked for this info, thank's!!!
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Old 08-03-2011, 07:14 AM   #5
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Any idea the weight of the block itself?
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Old 09-12-2011, 12:57 AM   #6
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how much can a stock bottom end handle....HP???
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Old 09-12-2011, 03:49 AM   #7
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Quote:
Originally Posted by Croman View Post
how much can a stock bottom end handle....HP???
I make 800 plus with a stock crank, so. A lot.
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Old 09-12-2011, 03:34 PM   #8
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Anybody know the rod length?
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Old 09-12-2011, 04:46 PM   #9
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Quote:
Originally Posted by agearhead4life View Post
anybody know the rod length?
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Old 09-12-2011, 04:56 PM   #10
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Quote:
Originally Posted by PREDATOR-Z View Post
6.098
Thanks!
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Old 09-13-2011, 01:12 AM   #11
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jermzz that's crazy....800hp nice!

thanks
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Old 11-20-2011, 03:48 PM   #12
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Dude, this article just saved my A$$. I was measuring ring end gap and was getting frustrated because the numbers werent matching up to the source measurements I had. It was probably for an LS1.

Thank you rdrage728!!!
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Old 11-20-2011, 06:53 PM   #13
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This is good. We got all the info on the LS2 and LS1 but no info on the truck motors. 75% of the engine builds on here are with a truck based platform.
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Old 11-20-2011, 08:05 PM   #14
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Hey op, could you somehow find out the deck thickness on a 241 head... Iv been told they have a rather thick deck for a stock casting but no one could confirm it. Does anyone else know?
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Old 12-13-2011, 10:03 PM   #15
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great source of info for us iron 6.0 users!
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Old 12-13-2011, 10:03 PM
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