Engine Mechanical Specifications LT1

Application
Specification

Metric
English

General Data

Engine Type
V8

Displacement
5.7L
350 CID

Bore
101.60 mm
4.000 in

Stroke
88.39 mm
3.480 in

Compression Ratio
10.4:1

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

Spark Plug Type
AC41-943

Spark Plug Gap
1.24 mm
0.050 in

Spark Plug Torque
20 N·m
15 lb ft

Oil Pressure (Minimum Hot)
41.4 kPa at 1,000 engine RPM

124.1 kPa at 2,000 engine RPM

165.4 kPa at 4,000 engine RPM
6.0 psig at 1,000 engine RPM

18.0 psig at 2,000 engine RPM

24.0 psig at 4,000 engine RPM

Oil Filter Torque
20 N·m
15 lb ft

Cylinder Bore

Diameter
101.618-101.643 mm
4.0007-4.0017 in

Out-of-Round Production
0.02 mm (Maximum)
0.001 in (Maximum)

Out-of-Round Service Limit
0.05 mm (Maximum)
0.002 in (Maximum)

Taper Production Thrust Side
0.012 mm (Maximum)
0.0005 in (Maximum)

Taper Production Relief Side
0.025 mm (Maximum)
0.0010 in (Maximum)

Taper Service Limit
0.025 mm (Maximum)
0.0010 in (Maximum)

Piston

Piston Bore Clearance-Production
0.025-0.068 mm
0.0010-0.0027 in

Piston Bore Clearance-Service Limit
0.068 mm (Maximum)
0.0027 mm (Maximum)

Piston Rings

Piston Compression Ring Groove Clearance-Production Top
0.050-0.090 mm
0.0019-0.0035 in

Piston Compression Ring Groove Clearance-Production 2nd
0.050-0.090 mm
0.0019-0.0035 in

Piston Compression Ring Groove Clearance-Service Limit
0.107 mm (Maximum)
0.0042 in (Maximum)

Piston Compression Ring Gap-Production Top
0.25-0.40 mm
0.010-0.016 in

Piston Compression Ring Gap-Production 2nd
0.46-0.66 mm (Maximum)
0.018-0.026 in (Maximum)

Piston Compression Ring Gap-Service Limit
0.88 (Maximum)
0.035 in (Maximum)

Piston Oil Ring Groove Clearance-Production
0.051-0.17 mm
0.002-0.007 in

Piston Oil Ring Groove Clearance-Service Limit
0.20 mm (Maximum)
0.008 in (Maximum)

Piston Oil Ring Gap-Production
0.25-0.76 mm
0.010-0.030 in

Piston Oil Ring Gap-Service Limit
1.65 mm (Maximum)
0.065 in (Maximum)

Piston Pin

Diameter
23.545-23.548 mm
0.9270-0.9271 in

Clearance in Piston-Production
0.0120-0.0210 mm
0.0004-0.0008 in

Clearance in Piston-Service Limit
0.025 mm (Maximum)
0.0010 in (Maximum)

Fit in Connecting Rod
0.021-0.040 mm (Interference)
0.0008-0.0016 in (Interference)

Crankshaft

Crankshaft Journal-Diameter #1
62.189-62.212 mm
2.4484-2.4493 in

Crankshaft Journal-Diameter #2, #3, #4
62.182-62.207 mm
2.4481-2.4491 in

Crankshaft Journal-Diameter #5
62.177-62.207 mm
2.4479-2.4491 in

Crankshaft Journal Taper-Production
0.005 mm (Maximum)
0.0002 in (Maximum)

Crankshaft Journal Taper-Service Limit
0.0025 mm (Maximum)
0.0001 in (Maximum)

Crankshaft Journal Out-of-Round-Production
0.005 mm (Maximum)
0.0002 in (Maximum)

Crankshaft Journal Out-of-Round-Service Limit
0.025 mm (Maximum)
0.0010 in (Maximum)

Crankshaft Bearing Clearance-Production #1
0.017-0.053 mm
0.0007-0.0021 in

Crankshaft Bearing Clearance-Production #2, #3, #4
0.022-0.061 mm
0.0009-0.0024 in

Crankshaft Bearing Clearance-Production #5
0.025-0.069 mm
0.0010-0.0027 in

Crankshaft Bearing Clearance-Service Limit #1
0.025-0.051 mm
0.0010-0.0020 in

Crankshaft Bearing Clearance-Service Limit #2, #3, #4
0.025-0.064 mm
0.0010-0.025 in

Crankshaft Bearing Clearance-Service Limit #5
0.038-0.076 mm
0.0015-0.0030 in

Crankshaft End Play
0.050-0.20 mm
0.002-0.008 in

Crankshaft Runout (At Rear Flange)
0.038 mm
0.0015 in

Connecting Rod

Connecting Rod Journal Diameter
53.284-53.334 mm
2.0978-2.0998 in

Connecting Rod Journal Taper-Production
0.007 mm (Maximum)
0.0003 in (Maximum)

Connecting Rod Journal Taper-Service Limit
0.025 mm (Maximum)
0.0010 in (Maximum)

Connecting Rod Journal Out-of-Round-Production
0.007 mm (Maximum)
0.0003 in (Maximum)

Connecting Rod Journal Out-of-Round-Service Limit
0.025 mm (Maximum)
0.0010 in (Maximum)

Rod Bearing Clearance-Production
0.033-0.088 mm
0.0013-0.0035 in

Rod Bearing Clearance-Service Limit
0.025-0.076 mm
0.0010-0.0030 in

Rod Side Clearance
0.16-0.35 mm
0.006-0.024 in

Camshaft

Journal Diameter
47.440-47.490 mm
1.8677-1.8697 in

End Play
0.11-0.30 mm
0.004-0.012 in

Lobe Lift
±0.050 mm
±0.002 in

Lobe Lift Intake
7.57 mm
0.298 in

Lobe Lift Exhaust
7.77 mm
0.306 in

Valve System

Valve Lifter
Hydraulic

Valve Rocker Arm Ratio
1.50:1

Valve Lash
1 ±¼ turn from zero lash

Face Angle
45 degrees

Seat Angle (Cylinder Head)
46 degrees

Seat Runout (Cylinder Head)
0.05 mm (Maximum)
0.002 in (Maximum)

Seat Width Intake (Cylinder Head)
0.76-1.27 mm
0.030-0.050 in

Seat Width Exhaust (Cylinder Head)
1.52-2.03 mm
0.060-0.080 in

Stem Clearance Production Intake
0.025-0.069 mm
0.0010-0.0027 in

Stem Clearance Production Exhaust
0.025-0.069 mm
0.0010-0.0027 in

Stem Clearance Service Limit Intake
0.093 mm (Maximum)
0.0037 in (Maximum)

Stem Clearance Service Limit Exhaust
0.119 mm (Maximum)
0.0047 in (Maximum)

Valve Spring Free Length
51.3 mm
2.02 in

Valve Spring Pressure Closed
360-396 N at 45.2 mm
81-89 lb at 1.78 in

Valve Spring Pressure Open
1090-1179 N at 33.8 mm
245-265 lb at 1.33 in

Valve Spring Installed Height Intake
45.2 mm
1.78 in

Valve Spring Installed Height Exhaust
45.2 mm
1.78 in

Valve Lift Intake
11.36 mm
0.447 in

Valve Lift Exhaust
11.66 mm
0.459 in

Cylinder Head Intake Manifold Surface Flatness (measured within a 152.4 mm (6.00 in) area)
0.10 mm
0.004 in

Cylinder Head Deck Surface Flatness
0.102 mm
0.004 in

Cylinder Head Exhaust Manifold Surface Flatness (measured within a 152.4 mm (6.00 in) area)
0.10 mm
0.004 in

 

Thats for a 1997, got it off service.gm.com pretty neat info!