Engine Mechanical Specifications. Pontiac Grand Prix 2008

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2008 🢒 Grand Prix 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Engine Mechanical Specifications

Application	Specification
Application	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 Munber of Coils	6.6