Engine Tolerance Specifications
Engine Type 90 degree V6Displacement 4.3 L 262 CID
RPO LU3
VIN X
Bore 101.60 mm (4.012 in)
Stroke 88.39 mm (3.480 in)
Compression Ratio 9.2:1
Firing Order 1-6-5-4-3-2
Spark Plug Gap 1.52 mm (0.060 in)
Balance Shaft
Bearing Journal Diameter - Rear 38.085-38.100 mm (1.4994-1.500 in)
Bushing Bore Diameter - Rear 0.050-0.088 mm (0.0020-0.0035 in)
Block
Crankshaft Main Bearing Bore Out-of-Round 0.050 mm (0.002 in)
Cylinder Bore Diameter 101.618-101.643 mm (4.0007-4.0017 in)
Cylinder Bore Out-of-Round - Production 0.017 mm (0.0007 in)
Cylinder Bore Out-of-Round - Service 0.05 mm (0.002 in)
Cylinder Bore Taper - Production Relief Side 0.025 mm (0.0010 in)
Cylinder Bore Taper - Production Thrust Side 0.012 mm (0.0005 in)
Cylinder Bore Taper - Service 0.025 mm (0.0010 in)
Cylinder Head Deck Surface Flatness 0.050-0.152 mm (0.002-0.006 in)
Camshaft
Camshaft End Play 0.0254-0.2286 mm (0.0010-0.0090 in)
Camshaft Journal Diameter 47.440-47.490 mm (1.8677-1.8696 in)
Camshaft Journal Out-of-Round 0.008 mm (0.0003 in)
Camshaft Lobe Lift - Exhaust 7.0953 mm (0.2793 in)
Camshaft Lobe Lift - Intake 6.8678 mm (0.2704 in)
Camshaft Runout 0.100 mm (0.0039 in)
Connecting Rod
Connecting Rod Bearing Clearance - Production 0.038-0.078 mm (0.0015-0.0031 in)
Connecting Rod Bearing Clearance - Service 0.025-0.063 mm (0.0010-0.0025 in)
Connecting Rod Side Clearance 0.15-0.44 mm (0.006-0.017 in)
Crankshaft
Connecting Rod Journal Diameter 57.116-57.148 mm (2.2487-2.2497 in)
Connecting Rod Journal Out-of-Round - Production 0.008 mm (0.0003 in)
Connecting Rod Journal Out-of-Round - Service 0.025 mm (0.0010 in)
Connecting Rod Journal Taper - Production 0.010 mm (0.0004 in)
Connecting Rod Journal Taper - Service 0.025 mm (0.0010 in)
Crankshaft End Play 0.050-0.20 mm (0.002-0.008 in)
Crankshaft Main Bearing Clearance #1 - Production 0.02-0.05 mm (0.0008-0.0020 in)
Crankshaft Main Bearing Clearance #2, #3, and #4 - Production 0.028-0.058 mm (0.0011-0.0023 in)
Crankshaft Main Bearing Clearance #1 - Service 0.0254-0.05 mm (0.0010-0.0020 in)
Crankshaft Main Bearing Clearance #2, #3, and #4 - Service 0.025-0.063 mm (0.0010-0.0025 in)
Crankshaft Main Journal Diameter #1 62.199-62.217 mm (2.4488-2.4495 in)
Crankshaft Main Journal Diameter #2 and #3 62.191-62.215 mm (2.4485-2.4494 in)
Crankshaft Main Journal Diameter #4 62.179-62.203 mm (2.4480-2.4489 in)
Crankshaft Main Journal Out-of-Round - Production 0.005 mm (0.0002 in)
Crankshaft Main Journal Out-of-Round - Service 0.025 mm (0.0010 in)
Crankshaft Main Journal Taper 0.007 mm (0.0003 in)
Exhaust Manifold
Surface Flatness - Flange to Flange 0.25 mm (0.010 in)
Surface Flatness - Individual Flange 0.05 mm (0.002 in)
Intake Manifold
Surface Flatness 0.10 mm (0.004 in)
Lubrication System
Oil Capacity with Filter 4.3L (4.5 qt)
Oil Capacity without Filter 3.8L (4 qt)
Oil Pressure - at 1,000 RPM 42 kPa (6 psi)
Oil Pressure - at 2,000 RPM 125 kPa (18 psi)
Oil Pressure - at 4,000 RPM 166 kPa (24 psi)
Piston Rings
Piston Ring End Gap - First Compression Ring - Production 0.25-0.40 mm (0.010-0.016 in)
Piston Ring End Gap - Second Compression Ring - Production 0.38-0.58 mm (0.015-0.023 in)
Piston Ring End Gap - Oil Control Ring - Production 0.25-0.76 mm (0.010-0.029 in)
Piston Ring End Gap - First Compression Ring - Service 0.25-0.50 mm (0.010-0.020 in)
Piston Ring End Gap - Second Compression Ring - Service 0.38-0.80 mm (0.015-0.031 in)
Piston Ring End Gap - Oil Control Ring - Service 0.005-0.090 mm (0.0002-0.0035 in)
Piston Ring to Groove Clearance - First Compression Ring - Production 0.030-0.070 mm (0.0012-0.0027 in)
Piston Ring to Groove Clearance - Second Compression Ring - Production 0.076-0.280 mm (0.0030-0.0110 in)
Piston Ring to Groove Clearance - Oil Control Ring - Production 0.046-0.196 mm (0.0018-0.0077 in)
Piston Ring to Groove Clearance - First Compression Ring - Service 0.030-0.085 mm (0.0012-0.0033 in)
Piston Ring to Groove Clearance - Second Compression Ring - Service 0.030-0.085 mm (0.0012-0.0033 in)
Piston Ring to Groove Clearance - Oil Control Ring - Service 0.076-0.200 mm (0.0030-0.0079 in)
Pistons and Pins
Piston - Piston to Bore Clearance - Production 0.018-0.061 mm (0.0007-0.0024 in)
Piston - Piston to Bore Clearance - Service 0.075 mm (0.0029 in)
Pin - Piston Pin Clearance to Connecting Rod Bore - Press Fit 0.012-0.048 mm (0.0005-0.0019 in)
Pin - Piston Pin Clearance to Piston Pin Bore - Production 0.013-0.023 mm (0.0005-0.0009 in)
Pin - Piston Pin Clearance to Piston Pin Bore - Service 0.025 mm (0.0010 in)
Pin - Piston Pin Diameter 23.545-23.548 mm (0.9270-0.9271 in)
Valve System
Valves - Valve Face Angle 45 degrees
Valves - Valve Seat Angle 46 degrees
Valves - Valve Seat Runout 0.05 mm (0.002 in)
Valves - Valve Seat Width - Intake 1.016-1.651 mm (0.040-0.065 in)
Valves - Valve Seat Width - Exhaust 1.651-2.489 mm (0.065-0.098 in)
Valves - Valve Stem Oil Seal Installed Height 1-2 mm (0.03937-0.07874 in)
Valves - Valve Stem-to-Guide Clearance - Intake - Production 0.025-0.069 mm (0.0010-0.0027 in)
Valves - Valve Stem-to-Guide Clearance - Intake - Service 0.025-0.094 mm (0.0010-0.0037 in)
Valves - Valve Stem-to-Guide Clearance - Exhaust - Production 0.025-0.069 mm (0.0010-0.0027 in)
Valves - Valve Stem-to-Guide Clearance - Exhaust - Service 0.025-0.094 mm (0.0010-0.0037 in)
Rocker Arms - Valve Rocker Arm Ratio 1.5:1
Valve Springs - Valve Spring Free Length 51.3 mm (2.02 in)
Valve Springs - Valve Spring Installed Height - Intake 42.92-43.43 mm (1.670-1.700 in)
Valve Springs - Valve Spring Installed Height - Exhaust 42.92-43.43 mm (1.670-1.700 in)
Valve Springs - Valve Spring Load - Closed 338-374 N at 43.2 mm (76-84 lb at 1.70 in)
Valve Springs - Valve Spring Load - Open 832-903 N at 32.3 mm (187-203 lb at 1.27 in)