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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 3.8L >> Specifications >> Engine Mechanical Specifications

Engine Mechanical Specifications

Application Specification
Metric English
General Data
  • Engine Type
 90 degrees V-6
  • Displacement
 3.8L 231 cu in
  • RPO
 L26
  • VIN
 2
  • Bore
 96.52 mm 3.8 in
  • Stroke
 86.36 mm 3.4 in
  • Compression Ratio VIN 2
 9.4:1
  • Firing Order
 1-6-5-4-3-2
  • Spark Plug Gap
 1.52 mm 0.60 in
Balance Shaft
  • Bearing Bore Diameter - Front
 51.973-51.999 mm 2.0462-2.0472 in
  • Bearing Bore Diameter-Rear-In Block
 47.584-47.612 mm 1.8735-1.8745 in
  • Bearing Inside Diameter - Rear
 38.117-38.194 mm 1.5007-1.5037 in
  • Bearing Journal Diameter - Rear
 38.072-38.105 mm 1.4989-1.5002 in
  • Bearing Clearance - Rear
 0.0127-0.1219 mm 0.0005-0.0048 in
  • End Play
 0.0-0.171 mm 0.0-0.0067 in
  • Gear Lash
 0.050-0.125 mm 0.002-0.0049 in
Block
  • Balance Shaft Bearing Bore Diameter - Front
 51.973-51.999 mm 2.0462-2.0472 in
  • Balance Shaft Bearing Inside Diameter - Rear
 38.118-38.194 mm 1.5007-1.5037 in
  • Balance Shaft Bearing Bore Diameter - Rear, In Block
 47.584-47.612 mm 1.8735-1.8745 in
  • Camshaft Bearing Inside Diameter - Front and Rear
 46.970-46.934 mm 1.8428-1.8492 in
  • Camshaft Bearing Inside Diameter - Middle #2, #3
 46.977-46.942 mm 1.8481-1.8495 in
  • Crankshaft Main Bearing Bore Diameter
 68.249-68.270 mm 2.6870-2.6878 in
  • Cylinder Bore Diameter
 98.5 mm 3.8 in
  • Cylinder Bore Out-of-Round - Diametral
 0.0254 mm 0.001 in
  • Cylinder Bore Taper
 0.0254 mm 0.001 in
  • Cylinder Head Deck Height
 216.459 mm 8.522 in
  • Cylinder Head Deck Surface Flatness - Overall
 0.0762 mm 0.003 in
  • Valve Lifter Bore Diameter
 21.424-21.450 mm 0.8435-0.8445 in
Camshaft
  • Camshaft Bearing Inside Diameter - 1 and 4
 46.970-46.934 mm 1.8478-1.8492 in
  • Camshaft Bearing Inside Diameter 2 and 3
 46.977-46.942 mm 1.8481-1.8495 in
  • Camshaft Journal Diameter
 47.655-46.858 mm 1.8462-1.8448 in
  • Camshaft Journal Out-of-Round
 0.00635 mm 0.00025 in
  • Camshaft Journal to Bearing Clearance
 0.041-0.119 mm 0.0016-0.0047 in
  • Camshaft Lobe Duration - Exhaust
 330 Crankshaft degrees
  • Camshaft Lobe Duration - Intake
 320 Crankshaft degrees
  • Camshaft Lobe Lift - Exhaust
 6.56 mm 0.258 in
  • Camshaft Lobe Lift - Intake
 6.56 mm 0.258 in
  • Camshaft Lobe Overlap
 96 Crankshaft degrees
Connecting Rod
  • Connecting Rod Bearing Clearance
 0.0127-0.0660 mm 0.0005-0.0026 in
  • Connecting Rod Bore Diameter
 60.295-60.312 mm 2.37378-2.3745 in
  • Connecting Rod Length - Center to Center
 143.205-143.307 mm 5.638-5.642 in
  • Connecting Rod Length - Center to Center - Non
 145.796-145.898 mm 5.740-5.744 in
  • Connecting Rod Side Clearance
 0.102-0.508 mm 0.004-0.0200 in
Crankshaft
  • Connecting Rod Journal Diameter
 57.1170-57.1475 mm 2.2487-2.2499 in
  • Connecting Rod Journal Out-of-Round
 0.00508 mm 0.00020 in
  • Connecting Rod Journal Taper
 0.00889 mm 0.00035 in
  • Crankshaft End Play
 0.076-0.276 mm 0.003-0.011 in
  • Crankshaft Main Bearing Clearance - #1
 0.0178-0.0406 mm 0.0007-0.0016 in
  • Crankshaft Main Bearing Clearance - #2, 3 and 4
 0.0229-0.0457 mm 0.0009-0.0018 in
  • Crankshaft Main Journal Diameter
 63.470-63.495 mm 2.4988-2.4998 in
  • Crankshaft Main Journal Out-of-Round
 0.00635 mm 0.00025 in
  • Crankshaft Main Journal Taper
 0.00889 mm 0.00035 in
  • Crankshaft Rear Flange Runout
 0.05 mm 0.002 in
  • Crankshaft Runout - from Main 2 & 3 to 1 & 4
 0.076 mm 0.003 in
Cylinder Head
  • Combustion Chamber Depth - at Measurement Point
 3.9166-5.4356 mm 0.154-0.214 in
  • Cylinder Head Height/Thickness
 103.492-104.178 mm 4.0745-4.1015 in
  • Surface Finish
 0.0032 mm 0.000125 in
  • Surface Flatness - Block Deck
 0.1016 mm 0.004 in
  • Surface Flatness - Exhaust Manifold Deck
 0.1016 mm 0.004 in
  • Surface Flatness - Intake Manifold Deck
 0.1016 mm 0.004 in
  • Valve Guide Bore - Exhaust
 8.001-8.0213 mm 0.3150-0.3158 in
  • Valve Guide Bore - Intake
 8.001-8.0213 mm 0.3150-0.3158 in
Exhaust Manifold
  • Surface Flatness - Maximum
 0.5 mm 0.02 in
Lubrication System
  • Oil Capacity - with Filter
 4.3L 4.5 qts
  • Oil Capacity - without Filter
 3.76L 4 qts
  • Oil Pressure - @ 1850 RPM
 414 kPa 60 psi
Oil Pump
  • Gear Pocket - Depth
 11.71-11.75 mm 0.461-0.4625 in
  • Gear Pocket - Diameter
 89.10-89.20 mm 3.508-3.512 in
  • Inner Gear Tip Clearance
 0.152 mm 0.006 in
  • Relief Valve-to-Bore Clearance
 0.038-0.076 mm 0.0015-0.003 in
Piston Ring End Gap
  • First Compression Ring
 0.25-0.46 mm 0.010-0.018 in
  • Second Compression Ring
 0.58-0.84 mm 0.023-0.033 in
  • Oil Control Ring
 0.254-0.762 mm 0.010-0.030 in
Piston Ring to Groove Clearance
  • First Compression Ring
 0.033-0.079 mm 0.0013-0.0031 in
  • Second Compression Ring
 0.033-0.079 mm 0.0013-0.0031 in
  • Oil Control Ring
 0.023-0.201 mm 0.0009-0.0079 in
Piston Ring Thickness
  • First Compression Ring
 1.176-1.197 mm 0.0463-0.0471 in
  • Second Compression Ring
 1.476-1.497 mm 0.0581-0.0589 in
  • Oil Control Ring
 1.854-2.007 mm 0.073-0.079 in
Pistons and Pins - Piston
  • Piston Diameter - Production - S/C
 96.489-96.528 mm 3.7988-3.8003 in
  • Piston Diameter - Production - Non S/C
 96.482-96.497 mm 3.7985-3.7991 in
  • Piston Diameter - Service Limit - Minimum - S/C
 96.434 mm 3.7966 in
  • Piston Diameter - Service Limit - Minimum - Non S/C
 96.442 mm 3.7969 in
  • Piston Pin Bore Diameter - S/C
 23.0065-23.0105 mm 0.9058-0.9059 in
  • Piston Pin Bore Diameter - Non S/C
 22.0060-22.0110 mm 0.8664-0.8666 in
  • Piston to Bore Clearance - New - VIN K
 0.010-0.051 mm 0.0004-0.0020 in
  • Piston to Bore Clearance - Used - VIN K
 0.050-0.091 mm 0.0020-0.0036 in
  • Piston to Bore Clearance - New - VIN 1
 -0.0207-0.0437 mm -0.0008-0.0018 in
  • Piston to Bore Clearance - Used VIN 1
 0.0193-0.0997 mm 0.0008-0.0039 in
Pistons and Pins - Pin
  • Piston Pin Clearance to Connecting Rod Bore - Clearance - VIN 2
 0.0066-0.0217 mm 0.0003-0.0009 in
  • Piston Pin Clearance to Piston Pin Bore - VIN K
 0.0020-0.0130 mm 0.00008-0.00051 in
  • Piston Pin Diameter - Clearance - VIN 4
 21.9950-22.000 mm 0.8659-0.8661 in
  • Piston Pin Clearance to Connecting Rod Bore - Press Fit - VIN 1
 0.0073-0.0225 mm 0.00029-0.00089 in
  • Piston Pin Clearance to Piston Pin Bore - VIN 1
 0.0065-0.0155 mm 0.00061-0.00026 in
  • Piston Pin Diameter - VIN 1
 22.995-23.000 mm 0.90531-0.90551 in
Valves
  • Valve Face Angle
 46 degrees
  • Valve Face Runout
 0.0508 mm 0.002 in
  • Valve Head Diameter - Intake
 46.37-46.63 mm 1.826-1.836 in
  • Valve Head Diameter - Exhaust
 38.481-38.735 mm 1.515-1.525 in
  • Valve Length
 119.464-119.972 mm 4.7033-4.7233 in
  • Valve Seat Angle
 45 degrees
  • Valve Seat Runout
 0.050 mm 0.002 in
  • Valve Seat Width - Intake
 1.53-2.03 mm 0.060-0.080-in
  • Valve Seat Width - Exhaust
 2.29-2.79 mm 0.090-0.110 in
  • Valve Stem Diameter
 7.948-7.965 mm 0.3129-0.3136 in
  • Valve Stem-to-Guide Clearance - Intake
 0.031-0.071 mm 0.0012-0.0028 in
  • Valve Stem-to-Guide Clearance - Exhaust
 0.036-0.074 mm 0.0014-0.0029 in
Valve Lifters/Push Rods
  • Push Rod Length - Intake, Yellow
 178.13 mm 7.013 in
  • Push Rod Length - Exhaust, Green
 178.13 mm 7.013 in
  • Valve Lifter Diameter
 21.387-21.405 mm 0.842-0.843 in
Valve Rocker Arms
  • Valve Rocker Arm Ratio
 1.66:1
Valve Springs
  • Valve Spring Free Length
 49.78 mm 1.960 in
  • Valve Spring Installed Height
 42.93-44.45 mm 1.690-1.750 in
  • Valve Spring Load - Closed
 334 N @ 43.69 mm 75 lb @ 1.72 in
  • Valve Spring Load - Open
 1014 N @ 32.4 mm 228 lb @ 1.277 in
  • Valve Spring Total Number of Coils
 6.6
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