Engine Mechanical Specifications. Pontiac Firebird 1997

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1997 🢒 Firebird 🢒 Engine 🢒 Engine Mechanical - 3.8L 🢒 Engine Mechanical Specifications

Application	Specifications
Application	Metric	English
General Data
Engine Type	90° V-6
Displacement	--	231 cu in
Liter (VIN)	3.8 (K)
RPO	L36
Bore	96.52 mm	3.8 in
Stroke	86.36 mm	3.4 in
Compression Ratio	9.4:1
Firing Order	1-6-5-4-3-2
Oil Pressure @ Operating Temperature	414 kPa	60 psi min
Cylinder Bore
Diameter	96.5 mm	3.8 in
Out Of Round Maximum	0.0254 mm	00.001 in
Taper	0.0254 mm	0.001 in
Piston
Clearance (39 mm from top of piston)	.010-0.051 mm	0.0004-0.0020 in
Piston Compression Ring
Piston Ring Groove Depth
Top Compression	4.019-4.14 mm	0.158-0.163 in
2nd Compression	4.214-4.341 mm	0.0166-0.171 in
Piston Ring End Gap
Top Compression	0.305-0.559 mm	0.012-0.022 in
2nd Compression	0.762-1.016 mm	0.030-0.040 in
Piston Ring Side Clearance
Top Compression	0.033-0.079 mm	0.0013-0.0031 in
2nd Compression	0.033-0.079 mm	0.0013-0.0031 in
Piston Ring Width
Top Compression	1.176-1.197 mm	0.0463-0.0471 in
2nd Compression	1.476-1.497 mm	0.0581-0.0589 in
Piston Oil Ring
Piston Ring Groove Depth	3.814-3.941 mm	0.150-0.155 in
Piston Ring End Gap	0.254-0.762 mm	0.010-0.030 in
Piston Ring Side Clearance	0.023-0.201 mm	0.0009-0.0079 in
Piston Ring Width	1.854-2.007 mm	0.073-0.079 in
Piston Pin
Diameter	21.9950-22.0000 mm	0.8659-0.8661 in
Clearance in Piston	0.0020-0.0130 mm	0.00008-0.00051 in
Fit In Rod (Clearance)	0.0066-0.0217 mm	0.0003-0.0009 in
Crankshaft-Main Bearings
Journal Diameter-All	63.470-63.495 mm	2.4988-2.4998 in
Taper-Maximum	0.0008 mm	0.0003 in
Out-of-Round-Maximum	0.0008 mm	0.0003 in
Crankshaft Bearing Clearance	0.020-0.055 mm	0.0008-0.0022 in
Crankshaft End Play	0.076-0.279 mm	0.003-0.011 in
Connecting Rod
Diameter	57.117-57.147 mm	2.2487-2.2499 in
Taper-Maximum	0.008 mm	0.0003 in
Out-of-Round	0.008 mm	0.0003 in
Rod Bearing Clearance	0.020-0.055 mm	0.0008-0.0022 in
Rod Side Clearance	0.076-0.381 mm	0.003-0.015 in
Camshaft
Journal Diameter	45.339-45.364 mm	1.7865-1.7885 in
Bearing Inside Diameter	45.377-45.428 mm	1.7865-1.7885 in
Bearing to Journal Clearance	0.013-0.089 mm	0.0005-0.0035 in
Camshaft Lobe Lift
Intake Maximum	6.43 mm	0.250 in
Exhaust Maximum	6.48 mm	0.255 in
Balance Shaft
End Play	0.0-0.203 mm	0.0-0.008 in
Radial Play-Front	0.0-0.028 mm	0.0-0.0011 in
Radial Play-Rear	0.0127-0.119 mm	0.0005-0.0047 in
Drive Gear Lash	0.050-0.127 mm	0.002-0.005 in
Bearing Bore Diameter-Front	51.973-51.999 mm	2.0462-2.0472 in
Bearing Bore Diameter-Rear	49.530-49.580 mm	1.950-1.952 in
Valve System
Lifter	Hydraulic
Rocker Arm Ratio	1.6:1
Face Angle	45 degrees
Seat Angle	45 degrees
Minimum Margin	0.635 mm	0.025 in
Seat Runout-Maximum	0.050 mm	0.002 in
Seat Width Intake	1.53-2.03 mm	0.060-0.080 in
Seat Width Exhaust	2.29-2.79 mm	0.090-0.110 in
Stem Height All	49.15-50.17 mm	1.935-1.975 in
Stem Clearance All	0.038-0.089 mm	0.0015-0.0032 in
Valve Spring
Free Length	50.32 mm	1.981 in
Load (Closed)	356 N @ 43.69 mm	80 lb @ 1.75 in
Load (Open)	935 N @ 33.4 mm	210 lb @ 1.315 in
Installed Height	42.93-44.45 mm	1.690-1.720 in
Approximate Number of Coils	4
Flywheel
Runout-Maximum	0.38 mm	0.015 in
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
Outer Gear Diameter Clearance	0.203-0.381 mm	0.008-0.015 in
End Clearance	0.025-0.089 mm	0.001-0.0035 in
Valve to Bore Clearance	0.038-0.076 mm	0.0015-0.003 in