What is the LS7 valve spring install height?
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From: Ft. Lauderdale, FL
What is the LS7 valve spring install height? I am looking to run a solid roller LS7 head and looking for the stock install height.
Does the stock GM LS7 head have enough install height to run a good spring and still open the valve in the high .700 to low .800?
Bob
Does the stock GM LS7 head have enough install height to run a good spring and still open the valve in the high .700 to low .800?
Bob
This is per GM document
Document ID# 1554984
2006 Chevrolet Corvette
--------------------------------------------------------------------------------
Engine Mechanical Specifications
Application
Specification
Metric
English
General
Engine Type
V8
Displacement
7.0L
427 CID
RPO
LS7
VIN
Y/E
Bore
104.766-104.784 mm
4.125-4.125 in
Stroke
101.6 mm
4.0 in
Compression Ratio
11.0:1
Firing Order
1-8-7-2-6-5-4-3
Spark Plug Gap
1.02 mm
0.04 in
Block
Camshaft Bearing Bore 1 and 5 Diameter
59.58-59.63 mm
2.345-2.347 in
Camshaft Bearing Bore 2 and 4 Diameter
59.08-59.13 mm
2.325-2.327 in
Camshaft Bearing Bore 3 Diameter
58.58-58.63 mm
2.306-2.308 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
104.766-104.784 mm
4.125-4.125 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
0.008 mm
0.0003 in
Camshaft Lobe Lift - Intake
8.4 mm
0.331 in
Camshaft Lobe Lift - Exhaust
8.34 mm
0.328 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 Diameter - Pin End
23.511-23.519 mm
0.926-0.926 in
Connecting Rod Bore Out-of-Round - Bearing End - Production
0.004-0.008 mm
0.00015-0.0003 in
Connecting Rod Bore Out-of-Round - Bearing End - Service
0.004-0.008 mm
0.00015-0.0003 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
127.9 mm
5.035 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
7.57 liters
8.0 quarts
Oil Capacity - without Filter
7.10 liters
7.5 quarts
Oil Pressure - Minimum at 100°C (212°F)
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
Oil Pan Alignment - to Rear of Engine Block at Transmission Bell Housing Mounting Surface
0.0-0.1 mm
0.0-0.004 in
Oil Pump Alignment - at Oil Pan Surface
0.0-0.1 mm
0.0-0.004 in
Crankshaft Rear Oil Seal Housing Alignment - at Oil Pan Surface
0.0-0.5 mm
0.0-0.02 in
Piston Rings
Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Production
0.22-0.47 mm
0.0087-0.0185 in
Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service
0.22-0.47 mm
0.0087-0.0185 in
Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production
0.40-0.66 mm
0.0157-0.0259 in
Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service
0.40-0.66 mm
0.0157-0.0259 in
Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production
0.25-0.76 mm
0.0098-0.0299 in
Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service
0.25-0.76 mm
0.0098-0.0299 in
Piston Ring to Groove Clearance - First Compression Ring - Production
0.030-0.10 mm
0.0012-0.0040 in
Piston Ring to Groove Clearance - First Compression Ring - Service
0.030-0.10 mm
0.0012-0.0040 in
Piston Ring to Groove Clearance - Second Compression Ring - Production
0.035-0.078 mm
0.0014-0.0031 in
Piston Ring to Groove Clearance - Second Compression Ring - Service
0.035-0.078 mm
0.0014-0.0031 in
Piston Ring to Groove Clearance - Oil Control Ring - Production
0.013-0.201 mm
0.0005-0.0079 in
Piston Ring to Groove Clearance - Oil Control Ring - Service
0.013-0.201 mm
0.0005-0.0079 in
Pistons and Pins
Pin - Piston Pin Clearance to Piston Pin Bore - Production
0.008-0.023 mm
0.0003-0.0009 in
Pin - Piston Pin Clearance to Piston Pin Bore - Service
0.008-0.023 mm
0.0003-0.0009 in
Pin - Piston Pin Diameter
23.497-23.503 mm
0.925-0.925 in
Pin - Piston Pin Fit in Connecting Rod Bore - Production
0.007-0.02 mm
0.00027-0.00078 in
Pin - Piston Pin Fit in Connecting Rod Bore - Service
0.007-0.0022 mm
0.00027-0.00086 in
Piston - Piston Diameter - Measured Over Skirt Coating
104.758-104.792 mm
4.124-4.126 in
Piston - Piston to Bore Clearance
-0.026 to +0.026 mm
-0.001 to +0.001 in
Valve System
Valves - Face Angle
45 degrees
Valves - Face Width
1.754-2.254 mm
0.069-0.089 in
Valves - Lash
Net Lash - No Adjustment
Valves - Lift - Intake
15.11 mm
0.595 in
Valves - Lift - Exhaust
15.01 mm
0.590 in
Valve Seat - Angle
45 degrees
Valve Seat - Runout
0.05 mm
0.002 in
Valve Seat - Width - Exhaust
1.7-2.0 mm
0.067-0.079 in
Valve Seat - Width - Intake
1.25-1.55 mm
0.049-0.061 in
Valves - Stem Diameter - Intake
7.958-7.9735 mm
0.313-0.314 in
Valves - Stem Diameter - Exhaust
7.956-7.976 mm
0.313-0.314 in
Valves - Stem-to-Guide Clearance - Production - Intake
0.028-0.063 mm
0.001-0.0024 in
Valves - Stem-to-Guide Clearance - Service - Intake
0.093 mm
0.0037 in
Valves - Stem-to-Guide Clearance - Production - Exhaust
0.025-0.066 mm
0.001-0.0026 in
Valves - Stem-to-Guide Clearance - Service - Exhaust
0.093 mm
0.0037 in
Rocker Arms - Rocker Arm Ratio
1.80:1
Valve Springs - Free Length
58.8 mm
2.313 in
Valve Springs - Installed Height
49.75 mm
1.959 in
Valve Springs - Load - Closed
450 N at 49.75 mm
101 lb at 1.96 in
Valve Springs - Load - Open
1380 N at 34.75 mm
310 lb at 1.37 in
Document ID# 1554984
2006 Chevrolet Corvette
--------------------------------------------------------------------------------
Engine Mechanical Specifications
Application
Specification
Metric
English
General
Engine Type
V8
Displacement
7.0L
427 CID
RPO
LS7
VIN
Y/E
Bore
104.766-104.784 mm
4.125-4.125 in
Stroke
101.6 mm
4.0 in
Compression Ratio
11.0:1
Firing Order
1-8-7-2-6-5-4-3
Spark Plug Gap
1.02 mm
0.04 in
Block
Camshaft Bearing Bore 1 and 5 Diameter
59.58-59.63 mm
2.345-2.347 in
Camshaft Bearing Bore 2 and 4 Diameter
59.08-59.13 mm
2.325-2.327 in
Camshaft Bearing Bore 3 Diameter
58.58-58.63 mm
2.306-2.308 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
104.766-104.784 mm
4.125-4.125 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
0.008 mm
0.0003 in
Camshaft Lobe Lift - Intake
8.4 mm
0.331 in
Camshaft Lobe Lift - Exhaust
8.34 mm
0.328 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 Diameter - Pin End
23.511-23.519 mm
0.926-0.926 in
Connecting Rod Bore Out-of-Round - Bearing End - Production
0.004-0.008 mm
0.00015-0.0003 in
Connecting Rod Bore Out-of-Round - Bearing End - Service
0.004-0.008 mm
0.00015-0.0003 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
127.9 mm
5.035 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
7.57 liters
8.0 quarts
Oil Capacity - without Filter
7.10 liters
7.5 quarts
Oil Pressure - Minimum at 100°C (212°F)
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
Oil Pan Alignment - to Rear of Engine Block at Transmission Bell Housing Mounting Surface
0.0-0.1 mm
0.0-0.004 in
Oil Pump Alignment - at Oil Pan Surface
0.0-0.1 mm
0.0-0.004 in
Crankshaft Rear Oil Seal Housing Alignment - at Oil Pan Surface
0.0-0.5 mm
0.0-0.02 in
Piston Rings
Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Production
0.22-0.47 mm
0.0087-0.0185 in
Piston Ring End Gap - First Compression Ring - Measured in Cylinder Bore - Service
0.22-0.47 mm
0.0087-0.0185 in
Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Production
0.40-0.66 mm
0.0157-0.0259 in
Piston Ring End Gap - Second Compression Ring - Measured in Cylinder Bore - Service
0.40-0.66 mm
0.0157-0.0259 in
Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Production
0.25-0.76 mm
0.0098-0.0299 in
Piston Ring End Gap - Oil Control Ring - Measured in Cylinder Bore - Service
0.25-0.76 mm
0.0098-0.0299 in
Piston Ring to Groove Clearance - First Compression Ring - Production
0.030-0.10 mm
0.0012-0.0040 in
Piston Ring to Groove Clearance - First Compression Ring - Service
0.030-0.10 mm
0.0012-0.0040 in
Piston Ring to Groove Clearance - Second Compression Ring - Production
0.035-0.078 mm
0.0014-0.0031 in
Piston Ring to Groove Clearance - Second Compression Ring - Service
0.035-0.078 mm
0.0014-0.0031 in
Piston Ring to Groove Clearance - Oil Control Ring - Production
0.013-0.201 mm
0.0005-0.0079 in
Piston Ring to Groove Clearance - Oil Control Ring - Service
0.013-0.201 mm
0.0005-0.0079 in
Pistons and Pins
Pin - Piston Pin Clearance to Piston Pin Bore - Production
0.008-0.023 mm
0.0003-0.0009 in
Pin - Piston Pin Clearance to Piston Pin Bore - Service
0.008-0.023 mm
0.0003-0.0009 in
Pin - Piston Pin Diameter
23.497-23.503 mm
0.925-0.925 in
Pin - Piston Pin Fit in Connecting Rod Bore - Production
0.007-0.02 mm
0.00027-0.00078 in
Pin - Piston Pin Fit in Connecting Rod Bore - Service
0.007-0.0022 mm
0.00027-0.00086 in
Piston - Piston Diameter - Measured Over Skirt Coating
104.758-104.792 mm
4.124-4.126 in
Piston - Piston to Bore Clearance
-0.026 to +0.026 mm
-0.001 to +0.001 in
Valve System
Valves - Face Angle
45 degrees
Valves - Face Width
1.754-2.254 mm
0.069-0.089 in
Valves - Lash
Net Lash - No Adjustment
Valves - Lift - Intake
15.11 mm
0.595 in
Valves - Lift - Exhaust
15.01 mm
0.590 in
Valve Seat - Angle
45 degrees
Valve Seat - Runout
0.05 mm
0.002 in
Valve Seat - Width - Exhaust
1.7-2.0 mm
0.067-0.079 in
Valve Seat - Width - Intake
1.25-1.55 mm
0.049-0.061 in
Valves - Stem Diameter - Intake
7.958-7.9735 mm
0.313-0.314 in
Valves - Stem Diameter - Exhaust
7.956-7.976 mm
0.313-0.314 in
Valves - Stem-to-Guide Clearance - Production - Intake
0.028-0.063 mm
0.001-0.0024 in
Valves - Stem-to-Guide Clearance - Service - Intake
0.093 mm
0.0037 in
Valves - Stem-to-Guide Clearance - Production - Exhaust
0.025-0.066 mm
0.001-0.0026 in
Valves - Stem-to-Guide Clearance - Service - Exhaust
0.093 mm
0.0037 in
Rocker Arms - Rocker Arm Ratio
1.80:1
Valve Springs - Free Length
58.8 mm
2.313 in
Valve Springs - Installed Height
49.75 mm
1.959 in
Valve Springs - Load - Closed
450 N at 49.75 mm
101 lb at 1.96 in
Valve Springs - Load - Open
1380 N at 34.75 mm
310 lb at 1.37 in
