General Data

• Engine Type

90 Degree V6

• RPO (VIN Code)

LF6 (X)

• Displacement

4.3L

262 CID

• Bore

101.60 mm

4.000 in

• Stroke

88.39 mm

3.480 in

• Compression Ratio

9.2:1

• Firing Order

1-6-5-4-3-2

• Spark Plug Gap

1.24 mm

0.060 in

• Oil Pressure (Minimum Hot)

41.4 kPa at 1,000 engine rpm (Minimum)

124.1 kPa at 2,000 engine rpm

165.4 kPa at 4,000 enigne rpm

6.0 psig at 1,000 engine rpm

18.0 psig at 2,000 engine rpm

24.0 psig at 4,000 enigne rpm

Lubrication System

• Oil Capacity Without Filter Change

3.75 Liters

4 Qts.

• Oil Capacity With Filter Change Add

0.398 Liters

0.42 Qts

Oil Pan

• Engine Block Clearance Tolerance

0.254 mm

0.010 in (Maximum)

Cylinder Head

• Surface Flatness

0.1016 mm

0.004 in (Maximum)

• Exhaust Manifold

• Surface Flatness

0.254 mm

0.010 in (Maximum)

Intake Manifold

• Surface Flatness

0.254 mm

0.010 in (Maximum)

Cylinder Bore

• Diameter

101.618-101.643 mm

4.0007-4.0017 in

• Out-of-Round Production

.0127 mm (Maximum)

0.0005 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)

0.001 in (Maximum)

• Taper Service Limit

0.025 mm (Maximum)

0.001 in (Maximum)

Piston

• Piston Bore Clearance-Production

.017-.05 mm

0.0007-0.002 in

• Piston Bore Clearance-Service Limit

.609 mm (Maximum)

0.0024 mm (Maximum)

Piston Rings (End Gap Measured in Cylinder Bore)

• Piston Compression Ring Groove Clearance-Production Top

0.508-1.524 mm

0.02-0.06 in

• Piston Compression Ring Groove Clearance-Production 2nd

1.016-2.032 mm

0.04-0.08 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

1.524-0.88  (Maximum)

0.06-0.035 in (Maximum)

• Piston Oil Ring Groove Clearance-Production

.508-0.17 mm

0.02-0.07 in

• Piston Oil Ring Groove Clearance-Service Limit

.508-2.032 mm (Maximum)

0.02-0.08 in (Maximum)

• Piston Oil Ring Gap-Production

.38-1.27 mm

0.015-0.050 in

• Piston Oil Ring Gap-Service Limit

.23-1.65 mm (Maximum)

0.009-0.065 in (Maximum)

Piston Pin

• Diameter

23.545-23.548 mm

0.9267-0.9271 in

• Clearance in Piston-Production

.005-.0177 mm

0.0002-0.0007 in

• Clearance in Piston-Service Limit

.025 mm (Maximum)

0.001 in (Maximum)

• Fit in Connecting Rod

0.021-0.040 mm (Interference)

0.0008-0.0016 in (Interference)

Crankshaft

• Crankshaft Journal-Diameter #1

62.199-62.217 mm

2.4488-2.4495 in

• Crankshaft Journal-Diameter #2, #3

62.191-62.215 mm

2.4485-2.4494 in

• Crankshaft Journal-Diameter # 4

62.179-62.203 mm

2.4479-2.4489 in

• Crankshaft Journal Taper-Production

.007 mm (Maximum)

0.0003 in (Maximum)

• Crankshaft Journal Taper-Service Limit

0.0254 mm (Maximum)

0.001 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)

0.001 in (Maximum)

• Crankshaft Bearing Clearance-Production #1

.02-.508 mm

0.0008-0.0020 in

• Crankshaft Bearing Clearance-Production # 2, # 3, #4

0.22-.635 mm

0.0010-0.025 in

• Crankshaft Bearing Clearance-Service Limit #1

0.0254-0.05

0.0010-0.0020 in

• Crankshaft Bearing Clearance-Service Limit #2, #3, #4

0.025-0.06 mm

0.0010-0.025 in

• Crankshaft End Play

0.050-0.20 mm

0.002-0.008 in

• Crankshaft Runout

0.025 mm

(Maximum)

0.001 in

Connecting Rod

• Connecting Rod Journal Diameter

57.116-57.148 mm

2.2487-2.2497 in

• Connecting Rod Journal Taper-Production

.00508 mm (Maximum)

0.0003 in (Maximum)

• Connecting Rod Journal Taper-Service Limit

0.025 mm (Maximum)

0.001 in (Maximum)

• Connecting Rod Journal Out-of-Round-Production

0.007 mm (Maximum)

0.0002 in (Maximum)

• Connecting Rod Journal Out-of-Round-Service Limit

0.025 mm (Maximum)

0.001 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

.15-0.43 mm

0.006-0.017 in

Camshaft

• Journal Diameter

47.452-47.478 mm

1.8682-1.8692 in

• End Play

0.0254-0.2286 mm

0.001-0.009 in

• Lobe Lift Intake

7.26-7.36 mm

0.286-0.290 in

• Lobe Lift Exhaust

7.42-7.52 mm

0.292-0.296 in

Balance Shaft

• Front Bearing Journal Diameter

54.985-55.001 mm

2.1648-2.1654 in

• Rear Bearing Journal Diameter

38.084-38.100 mm

1.4994-1.500 in

• Rear Bearing Journal Clearance

0.0254-0.09144 mm

0.001-0.0036 in

Valve System

• Valve Lifter

Hydraulic Roller Type

• Valve Rocker Arm Ratio

1.50:1

• Valve Lash

Net Lash No Adjustment

• Face Angle

45 degrees

• Seat Angle

46 degrees

• Seat Runout

0.05 mm (Maximum)

0.002 in (Maximum)

• Seat Width Intake

.89-1.52 mm

0.035-0.060 in

• Seat Width Exhaust

1.575-2.362 mm

0.065-0.098 in

• Stem Clearance Production Intake

.0279-0.069 mm

0.0011-0.0027 in

• Stem Clearance Production Exhaust

.0279-0.069 mm

0.0011-0.0027 in

• Stem Clearance Service Limit Intake

.0254 mm (Maximum)

0.001 in (Maximum)

• Stem Clearance Service Limit Exhaust

0.0508 mm (Maximum)

0.002 in (Maximum)

• Valve Spring Free Length

51.56 mm

2.03 in

• Valve Spring Pressure Closed

338-374 N at 43 mm

76-84 lb at 1.78 in

• Valve Spring Pressure Open

832-903 N at 32 mm

187-203 lb at 1.27 in

• Valve Spring Installed Height Intake

45.2 mm

1.78 in

• Valve Spring Installed Height Exhaust

45.2-43.43 mm

1.690-1.710 in

• Valve Lift Intake

10.52 mm

0.414 in

• Valve List Exhaust

10.87 mm

0.428 in