LQ4 piston to bore clearance
11-23-2005, 02:19 PM
#1
LQ4 piston to bore clearance
Are they the same for the other iron blocks (lm7/5.3) or the ls1? If not, does anyone have the spec?
Is there anyway to measure this without removing the piston? I got a shortblock that had been line honed and new rings put on the used pistons and they seem a little loose in the bore to me.
Is there anyway to measure this without removing the piston? I got a shortblock that had been line honed and new rings put on the used pistons and they seem a little loose in the bore to me.
11-23-2005, 03:54 PM
#2
Engine Mechanical Specifications (LQ4 VIN U)
Metric
English
General
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
--------------------------------------------------------------------------------
Document ID# 1204179
2004 Chevrolet Tahoe - 2WD
Heres some info for ya
Metric
English
General
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
--------------------------------------------------------------------------------
Document ID# 1204179
2004 Chevrolet Tahoe - 2WD
Heres some info for ya
11-23-2005, 04:05 PM
#3
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Piston is smaller in diameter at the top and around all the ring lands. The piston to wall clearance is measured at the center or torward the top of the skirt. If you are looking at the top of the piston in the cyl it may look like you have .020 of clearence.
11-23-2005, 05:49 PM
#5
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Originally Posted by BigKID
Thanks Randy! 
mj... That helps although the piston has a bit of play in the bore. Should I be able to move it around much with my hand?
mj... That helps although the piston has a bit of play in the bore. Should I be able to move it around much with my hand?
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