Engine Mechanical Specifications. Cadillac STS 2006

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2006 🢒 STS 🢒 Preface 🢒 Cautions and Notices 🢒 Engine Mechanical Specifications

Application	Specification
Application	Metric	English
General
Engine Type	V-8
Displacement	4.4 Liter	267 cu in
RPO	LC3
VIN	D
Bore	91 mm	3.5827 in
Stroke	84 mm	3.3071 in
Compression Ratio	9.0:1
Engine Compression Test	900-1090 kPa	131-158 psi
Firing Order	1-2-7-3-4-5-6-8
Spark Plug Gap	1.020 mm	0.0400 in
Block
Crankshaft Main Bearing Bore Diameter	72.430-72.442 mm	2.8516-2.8521 in
Crankshaft Main Bearing Bore Out-of-Round	0.010 mm	0.0004 in
Crankshaft Main Rear Oil Seal
Bore	115.962-116.038 mm	4.5654-4.5684 in
Runout	0.250 mm	0.0098 in
Cylinder Bore Diameter @ 45 mm (1.7717 in) Below Deck Face	90.992-91.008 mm	3.5824-3.5830 in
Cylinder Bore Out-of-Round
Production	0.010 mm	0.0004 in
Service	0.100 mm	0.0039 in
Cylinder Bore Taper
Production	0.010 mm	0.0004 in
Service	0.100 mm	0.0039 in
Cylinder Head Deck Height	224.55 mm	8.8406 in
Cylinder Head Deck Surface Flatness	0.100 mm	0.0039 in
Camshaft
Camshaft End Play	0.120-0.220 mm	0.0050-0.0087 in
Camshaft Journal Diameter	26.948-26.972 mm	1.0610-1.0619 in
Camshaft Journal Out-of-Round	0.006 mm	0.0002 mm
Camshaft Journal to Bore Clearance
Production	0.041-0.085 mm	0.0016-0.0034 in
Service	0.040-0.090 mm	0.0016-0.0035 in
Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Exhaust	260.5 degrees
Camshaft Lobe Duration @ 0.150 mm (0.006 in) Lift - Intake	246 degrees
Camshaft Lobe Lift - Exhaust	5.94 mm	0.2339 in
Camshaft Lobe Lift - Intake	6.1659 mm	0.2428 in
Camshaft Lobe Overlap @ 0.150 mm (0.006 in) Lift	0.0 degrees
Camshaft Runout	0.050 mm	0.0020 in
Camshaft Thrust Surface
Runout	0.037 mm	0.0015 in
Width	22.990-23.090 mm	0.9051-0.9091 in
Camshaft Timing @ 0.150 mm (0.006 in) Lift
Intake Opens	11.5 degrees ATDC
Intake Centerline	133.0 degrees ATDC
Intake Closes	257.5 degrees ATDC
Exhaust Opens	246.1 degrees BTDC
Exhaust Centerline	117.0 degrees BTDC
Exhaust Closes	14.4 degrees ATDC
Camshaft Position Actuator
Exhaust Authority	50 crankshaft degrees/25 camshaft degrees
Intake Authority	40 crankshaft degrees/20 camshaft degrees
Cooling System
Thermostat Full Open Temperature	85°C	185°F
Connecting Rod
Connecting Rod Bearing Clearance
Production and Service	0.0250-0.0760 mm	0.0010-0.0030 in
Connecting Rod Bore Diameter - Bearing End	57.136-57.152 mm	2.2495-2.2501 in
Connecting Rod Bore Diameter - Pin End	24.006-24.018 mm	0.9451-0.9456 in
Connecting Rod Bore Out-of-Round - Bearing End	0.006 mm	0.0002 in
Connecting Rod Bore Out-of-Round - Pin End	0.005 mm	0.0002 in
Connecting Rod Length Center to Center	151.00 mm	5.9449 in
Connecting Rod Side Clearance	0.200-0.500 mm	0.0079-0.0197 in
Connecting Rod Straightness	0.050 mm	0.0020 in
Crankshaft
Connecting Rod Journal Diameter	53.947-53.963 mm	2.1239-2.1245 in
Connecting Rod Journal Out-of-Round	0.005 mm	0.0002 in
Connecting Rod Journal Taper	0.005 mm	0.0002 in
Connecting Rod Journal Width	43.840-43.960 mm	1.7260-1.7307 in
Crankshaft Balancer
Surface Diameter	50.730-50.870 mm	1.9972-2.0028 in
Hub Inside Diameter	34.847-34.864 mm	1.3719-1.3726 in
Crankshaft End Play	0.050-0.500 mm	0.0020-0.0197 in
Crankshaft Main Bearing Clearance
Production	0.0150-0.0550 mm	0.0006-0.0022 in
Service	0.0150-0.0635 mm	0.0006-0.0025 in
Crankshaft Main Journal Diameter	64.350-64.366 mm	2.5335-2.5341 in
Crankshaft Main Journal Out-of-Round	0.005 mm	0.0002 in
Crankshaft Main Journal Taper	0.005 mm	0.0002 in
Crankshaft Main Journal Thrust Wall Runout	0.040 mm	0.0016 in
Crankshaft Main Journal Thrust Wall Square	0.010 mm	0.0004 in
Crankshaft Main Journal Width, #1, #2, #4, #5	24.540-24.660 mm	0.9661-0.9709 in
Crankshaft Main Journal Width, Thrust #3	25.150-25.250 mm	0.9902-0.9941 in
Crankshaft Nose Diameter
From Front Face 0.00-21.00 mm (0.0000-0.8268 in)	34.500-34.750 mm	1.3583-1.3681 in
From Front Face 21.00-53.00 mm (0.8268-2.0866 in)	34.892-34.912 mm	1.3737-1.3745 in
From Front Face 53.00 to Rolled Fillet (2.0866-Rolled Fillet)	33.450-33.550 mm	1.3169-1.3209 in
From Front Face 89.94-110.54 mm (3.5409-4.3520 in)	44.950-45.000 mm	1.7697-1.7717 in
Crankshaft Nose Runout
From Front Face 0.00-21.00 mm (0.0000-0.8268 in)	0.100 mm	0.0039 in
From Front Face 21.00-53.00 mm (0.8268-2.8066 in)	0.030 mm	0.0012 in
From Front Face 53.00 to Rolled Fillet (2.0866-Rolled Fillet)	0.100 mm	0.0039 in
From Front Face 89.94-110.54 mm (3.5409-4.3520 in)	0.025 mm	0.0010 in
Crankshaft Rear Flange
Diameter	95.880-95.980 mm	3.7748-3.7787 in
Runout	0.025 mm	0.0010 in
Crankshaft Rear Flange Face to Engine Flywheel Runout	0.025 mm	0.0010 in
Crankshaft Runout
Main Journals #1, #5	0.022 mm	0.0009 in
Main Journals #2, #4, #6	0.025 mm	0.0010 in
Cylinder Head
Camshaft Bearing Bore Diameter	27.013-27.033 mm	1.0635-1.0642 in
Camshaft Bearing Bore Out-of-Round	0.010 mm	0.0004 in
Combustion Chamber Depth - at Measurement Point	10.470-10.710 mm	0.4122-0.4217 in
Cylinder Head Height - Deck to Camshaft Centerline Bore	136.00 mm	5.3543 in
Surface Flatness - Block Deck	0.050 mm	0.0020 in
Surface Flatness - Exhaust Manifold Deck	0.220 mm	0.0087 in
Surface Flatness - Intake Manifold Deck	0.220 mm	0.0087 in
Valve Guide Bore - Exhaust	5.969-5.989 mm	0.2350-0.2359 in
Valve Guide Bore - Intake	5.969-5.989 mm	0.2350-0.2359 in
Valve Guide Installed Height - Exhaust	14.300 mm	0.5630 in
Valve Guide Installed Height - Intake	14.720 mm	0.5795 in
Valve Lifter Bore Diameter	12.013-12.037 mm	0.4730-0.4739 in
Flywheel
Runout	0.300 mm	0.0118 in
Lubrication System
Oil Capacity - with New Dry Oil Filter	8.5 Liters	9.0 Quarts
Oil Pressure - Minimum @ Idle	35 kPa	5 psi
Oil Pressure - Minimum @ 2,000 RPM	250 kPa	35 psi
Piston Rings
Piston Ring End Gap
First Compression Ring	0.150-0.300 mm	0.0059-0.0118 in
Second Compression Ring	0.300-0.450 mm	0.0118-0.0177 in
Oil Control Ring	0.250-0.500 mm	0.0098-0.0197 in
Piston Ring to Groove Clearance
First Compression Ring	0.040-0.095 mm	0.0016-0.0037 in
Second Compression Ring	0.040-0.095 mm	0.0016-0.0037 in
Oil Control Ring	None - Side Sealing
Piston Ring Thickness
First Compression Ring	1.199-1.203 mm	0.0472-0.0474 in
Second Compression Ring	1.499-1.504 mm	0.0590-0.0592 in
Oil Control Ring	1.876-1.974 mm	0.0739-0.0777 in
Pistons and Pins
Piston
Piston Diameter @ 42 mm (1.6353 in) Below Crown with Piston Skirt Coating	90.967-90.990 mm	3.5814-3.5823 in
Piston Pin Bore Diameter	24.002-24.009 mm	0.9450-0.9452 in
Piston Ring Groove Inside Diameter
First Compression Ring	82.520-82.770 mm	3.2488-3.2587 in
Second Compression Ring	81.660-81.910 mm	3.2150-3.2248 in
Oil Control Ring	84.210-84.460 mm	3.3153-3.3252 in
Piston Ring Groove Width
First Compression Ring	1.230-1.255 mm	0.0484-0.0494 in
Second Compression Ring	1.530-1.555 mm	0.0602-0.0612 in
Oil Control Ring	2.008-2.028 mm	0.0791-0.0798 in
Piston to Bore Clearance with Piston Skirt Coating	-0.016-0.031 mm	-0.0006-0.0012 in
Pin
Piston Pin Clearance to Connecting Rod Bore	0.006-0.021 mm	0.0002-0.0008 in
Piston Pin Clearance to Piston Pin Bore	0.002-0.012 mm	0.0001-0.0005 in
Piston Pin Diameter	23.997-24.000 mm	0.9448-0.9449 in
Piston Pin Length	65.240-65.740 mm	2.5685-2.5882 in
Valve System
Valves
Valve Face Angle	45 degrees
Valve Face Runout	0.038 mm	0.0015 in
Valve Face Width
Exhaust	1.500 mm	0.0591 in
Intake	1.000 mm	0.0394 in
Valve Head Diameter
Exhaust	28.880-29.140 mm	1.1370-1.1472 in
Intake	36.090-36.350 mm	1.4209-1.4311 in
Valve Length
Exhaust	91.730-91.990 mm	3.6114-3.6217 in
Intake	110.600-110.860 mm	4.3543-4.3646 in
Valve Seat Angle	45.75 degrees
Valve Seat Relief Angle	20 degrees
Valve Seat Relief Width
Exhaust	0.160-0.360 mm	0.0063-0.0142 in
Intake	0.110-0.310 mm	0.0043-0.0118 in
Valve Seat Runout	0.050 mm	0.0020 in
Valve Seat Undercut Angle
Exhaust	65 degrees
Intake	60 degrees
Valve Seat Width
Exhaust	1.300-1.700 mm	0.0512-0.0669 in
Intake	0.420-0.820 mm	0.0165-0.0323 in
Valve Stem Diameter	5.920-5.940 mm	0.2331-0.2339 in
Valve Stem Out-of-Round	0.008 mm	0.0003 in
Valve Stem Straightness	0.013 mm	0.0005 in
Valve Stem-to-Guide Clearance
Exhaust
Production	0.050-0.100 mm	0.0020-0.0039 in
Service	0.050-0.120 mm	0.0020-0.0047 in
Intake
Production	0.028-0.068 mm	0.0011-0.0027 in
Service	0.028-0.110 mm	0.0011-0.0043 in
Valve Lifters
Valve Lifter Diameter	11.986-12.000 mm	0.4719-0.4724 in
Valve Lifter-to-Bore Clearance	0.037-0.041 mm	0.0015-0.0016 in
Rocker Arms
Valve Rocker Arm Ratio	1.68 to 1
Valve Rocker Arm Roller Diameter	17.740-17.800 mm	0.6984-0.7008 in
Valve Springs
Valve Spring Coil Thickness	4.110 x 3.280 mm	0.1618 x 0.1291 in
Valve Spring Diameter
Inside	17.750-18.250 mm	0.6988-0.7185 in
Outside	26.23 mm	1.0327 in
Valve Spring Free Length	40.790-43.690 mm	1.6059-1.7201 in
Valve Spring Height
Closed	35.000 mm	1.3780 in
Open	24.500 mm	0.9646 in
Valve Spring Load
Closed	211.4-233.4 mm	47.5-52.4 lb
Open	579.0-631.0 mm	130.2-141.9 lb
Valve Spring Total Number of Coils	6.90-7.10