Engine Mechanical Specifications (L87)

Engine Mechanical Specifications

Application	Specification
Engine Type	V8
Displacement	6.2L	376 CID
Bore	103.25 mm	4.064 in
Stroke	92.0 mm	3.622 in
Compression Ratio	11.5:1
Firing Order	1–8–7–2–6–5–4–3
Spark Plug Gap	0.95–1.10 mm	0.037–0.043 in
Camshaft Bearing Bore 1 and 5 Diameter	59.58–59.63 mm	2.345–2.347 in
Camshaft Bearing Bore 2 and 4 Diameter	59.08–59.13 mm	2.325–2.327 in

	Application	Specification
	Camshaft Bearing Bore 3 Diameter	58.58–58.63 mm	2.306–2.308 in
	Crankshaft Main Bearing Bore Diameter	69.869–69.891 mm	2.751–2.752 in
	Crankshaft Main Bearing Bore Out-of-Round	0.008 mm	0.00031 in
	Cylinder Bore Diameter	103.239–103.261 mm	4.0645–4.0654 in
	Cylinder Head Deck Height – Measuring from the Centerline of Crankshaft to the Deck Face	234.575–234.825 mm	9.235–9.245 in
	Cylinder Head Deck Surface Flatness – Measured Within a 150.00 mm (5.9 in) Area	0.05 mm	0.002 in
	Cylinder Head Deck Surface Flatness – Measuring the Overall Length of the Block Deck	0.1 mm	0.0039 in
	Valve Lifter Bore Diameter	21.417–21.443 mm	0.843–0.844 in
	Valve Lifter Follower Bore Diameter	29.187–29.213 mm	1.149–1.150 in
	Camshaft End Play	0.025–0.305 mm	0.001–0.012 in
	Camshaft Journal Diameter	54.990–55.015 mm	2.164–2.166 in
	Camshaft Bearing Diameter	55.063–55.088 mm	2.1678–2.1688 in
	Camshaft Journal-to-Bearing Clearance	0.048–0.098 mm	0.0019–0.0038 in
		0.006 mm	0.0002 in

	Application	Specification
	Camshaft Lobe Lift – Exhaust Non AFM	7.360 mm	0.290 in
	Camshaft Lobe Lift – Exhaust AFM	7.490 mm	0.295 in
	Camshaft Lobe Lift – Intake Non AFM	7.760 mm	0.306 in
	Camshaft Lobe Lift – Intake AFM	7.890 mm	0.311 in
	Fuel Pump Lobe Lift	5.70 mm	0.224 in
	Camshaft Runout – Measured at the Intermediate Journals	0.05 mm	0.002 in
	Camshaft Position Actuator
	Range of Authority	62 degrees
	Park Position	7 degrees Advanced
	Connecting Rod
	Connecting Rod Bearing Clearance – Production	0.024–0.064 mm	0.0009–0.0025 in
	Connecting Rod Bearing Clearance – Service	0.023–0.076 mm	0.0009–0.0029 in
	Connecting Rod Bore Diameter – Bearing End	56.505–56.525 mm	2.224–2.225 in
	Connecting Rod Bore Out-of-Round – Bearing End – Production	0.006 mm	0.00023 in
	Connecting Rod Bore Out-of-Round – Bearing	0.008 mm	0.0003 in

	Application	Specification
	Connecting Rod Side Clearance	0.125–0.495 mm	0.004–0.019 in
	Crankshaft
	Connecting Rod Journal Diameter – Production	53.320–53.336 mm	2.0992–2.0998 in
	Connecting Rod Journal Diameter – Service	53.31 mm	2.0996 in
	Connecting Rod Journal Out-of-Round – Production	0.005 mm	0.0002 in
	Connecting Rod Journal Out-of-Round – Service	0.01 mm	0.0004 in
	Connecting Rod Journal Taper – Maximum for 1/2 of Journal Length – Production	0.008 mm	0.0003 in
	Connecting Rod Journal Taper – Maximum for 1/2 of Journal Length – Service	0.015 mm	0.00059 in
	Crankshaft End Play	0.040–0.220 mm	0.0015–0.0086 in
	Crankshaft Main Bearing Clearance – Production	0.02–0.052 mm	0.0008–0.0021 in
	Crankshaft Main Bearing Clearance – Service	0.02–0.065 mm	0.0008–0.0025 in
	Crankshaft Main Journal Diameter – Production	64.992–65.008 mm	2.558–2.559 in
	Crankshaft Main Journal Diameter – Service	64.982 mm	2.558 in
	Crankshaft Main Journal Out-of-Round – Production	0.005 mm	0.00019 in

	Application	Specification
	Crankshaft Main Journal Out-of-Round – Service	0.01 mm	0.0004 in
	Crankshaft Main Journal Taper – Production	0.008 mm	0.0003 in
	Crankshaft Main Journal Taper – Service	0.015 mm	0.00059 in
	Crankshaft Rear Flange Runout	0.025 mm	0.00098 in
	Crankshaft Reluctor Ring Runout – Measured 1.0 mm (0.04 in) Below Tooth Diameter	0.7 mm	0.028 in
	Crankshaft Thrust Surface – Production	26.14–26.22 mm	1.029–1.0315 in
	Crankshaft Thrust Surface – Service	26.22 mm	1.0315 in
	Crankshaft Thrust Surface Runout	0.04 mm	0.002 in
	Cylinder Head
	Cylinder Head Height/Thickness – Measured from the Cylinder Head Deck to the Valve Rocker Arm Cover Seal Surface	132.5 mm	5.216 in
	Surface Flatness – Block Deck – Measured Within a 152.4 mm (6.0 in) Area	0.05 mm	0.0019 in
	Surface Flatness – Block Deck – Measuring the Overall Length of the Cylinder Head	0.1 mm	0.004 in
	Surface Flatness – Exhaust Manifold Face	0.1 mm	0.004 in
	Surface Flatness – Intake Manifold Face	0.1 mm	0.004 in

Application	Specification
Valve Guide Installed Height – Measured from the Spring Seat Surface to the Top of the Guide	17.05–17.55 mm	0.671–.691 in
Injector Bore Diameter	7.65–7.87 mm	0.301–0.309 in
Intake Manifold
Surface Flatness – Measured at Gasket Sealing Surfaces and Measured Within a 200 mm (7.87 in) Area that Includes 2 Runner Port Openings	0.3 mm	0.118 in
Lubrication System
Oil Pressure – Minimum – Hot	152 kPa at 1,000 engine RPM 207 kPa at 2,000 engine RPM 228 kPa at 3,000 engine RPM	22 psig at 1,000 engine RPM 30 psig at 2,000 engine RPM 33 psig at 3,000 engine RPM
Active Fuel Management Relief Valve Oil Pressure – as Measured at Oil Pressure Sensor Location	379–517 kPa Maximum	55–75 psig Maximum
Front Cover Alignment – at Oil Pan Surface	0.0–0.5 mm	0.0–0.02 in
Crankshaft Rear Oil Seal Housing Alignment – at Oil Pan Surface	0.0–0.5 mm	0.0–0.02 in
Oil Pan Alignment – to Rear of Engine Block at Transmission Bell Housing Mounting Surface	0.0–0.1 mm	0.0–0.004 in
Piston Rings
Piston Ring End Gap – First Compression Ring – Measured in Cylinder Bore – Production	0.23–0.39 mm	0.009–0.0153 in

Application	Specification
Piston Ring End Gap – First Compression Ring – Measured in Cylinder Bore – Service	0.23–0.45 mm	0.009–0.0177 in
Piston Ring End Gap – Second Compression Ring – Measured in Cylinder Bore – Production	0.32–0.63 mm	0.0126–0.0248 in
Piston Ring End Gap – Second Compression Ring – Measured in Cylinder Bore – Service	0.32–0.69 mm	0.0126–0.0272 in
Piston Ring End Gap – Oil Control Ring – Measured in Cylinder Bore – Production	0.22–0.79 mm	0.0086–0.0311 in
Piston Ring End Gap – Oil Control Ring – Measured in Cylinder Bore – Service	0.22–0.85 mm	0.0086–0.0335 in
Piston Ring-to-Groove Clearance – First Compression Ring – Production	0.040–0.083 mm	0.0016–0.0033 in
Piston Ring-to-Groove Clearance – First Compression Ring – Service	0.040–0.083 mm	0.0016–0.0033 in
Piston Ring-to-Groove Clearance – Second Compression Ring – Production	0.040–0.083 mm	0.0016–0.0033 in
Piston Ring-to-Groove Clearance – Second Compression Ring – Service	0.040–0.083 mm	0.0016–0.0033 in
Piston Ring-to-Groove Clearance – Oil Control Ring – Production	0.013–0.201 mm	0.0005–0.0079 in
Piston Ring-to-Groove Clearance – Oil Control Ring – Service	0.013–0.201 mm	0.0005–0.0079 in
Pistons and Pins

Application	Specification
Pin – Piston Pin Clearance-to-Piston Pin Bore – Production	0.002–0.01 mm	0.00008–0.0004 in
Pin – Piston Pin Clearance-to-Piston Pin Bore – Service	0.002–0.015 mm	0.00008–0.0006 in
Pin – Piston Pin Diameter	23.952–23.955 mm	0.9430–0.9431 in
Pin – Piston Pin Fit in Connecting Rod Bore – Production	0.007–0.02 mm	0.00027–0.00078 in
Pin – Piston Pin Fit in Connecting Rod Bore – Service	0.007–0.022 mm	0.00027–0.00086 in
Piston – Piston Diameter – Measured Over Skirt Coating	103.258–103.289 mm	4.0653–4.0665 in
Piston – Piston to Bore Clearance – Production	−0.048 to +0.001 mm	−0.0019 to +0.000 in
Piston – Piston to Bore Clearance – Service Limit With Skirt Coating Worn Off	0.052 mm	0.0020 in
Valve System
Valves – Valve Face Angle	45 degrees
Valves – Valve Face Width	1.25 mm	0.05 in
Valves – Valve Lash	Net Lash – No Adjustment
Valve Lift – Exhaust Non AFM	13.250 mm	0.521 in

Application	Specification
Valve Lift – Exhaust	13.503 mm	0.531 in
Valve Lift – Intake Non AFM	14.000 mm	0.551 in
Valve Lift – Intake	14.253 mm	0.561
Valves – Valve Seat Angle	45 degrees
Valves – Valve Seat Runout	0.05 mm	0.002 in
Valves – Valve Seat Runout	0.08 mm	0.003 in
Valves – Valve Seat Width – Exhaust	2.52 mm	0.099 in
Valves – Valve Seat Width – Intake	1.98 mm	0.078 in
Valves – Valve Stem Diameter – Production	7.955–7.976 mm	0.313–0.314 in
Valves – Valve Stem Diameter – Service	7.95 mm	0.313 in
Note: For valve stem to guide clearance – valve guide inner diameter measurements must be recorded at a depth of 7 mm (0.26 in) in the valve guide bore.
Valves – Valve Stem-to-Guide Clearance – Production – Exhaust	0.025–0.066 mm	0.001–0.0026 in
Valves – Valve Stem-to-Guide Clearance – Service – Exhaust	0.093 mm	0.0037 in
Valves – Valve Stem-to-Guide Clearance – Production – Intake	0.025–0.066 mm	0.001–0.0026 in

Application	Specification
Valves – Valve Stem-to-Guide Clearance – Service – Intake	0.093 mm	0.0037 in
Valves – Valve Stem Height – Measured from Spring Seat – Intake and Exhaust	51.945–52.695 mm	2.045–2.074 in
Rocker Arms – Valve Rocker Arm Ratio	1.80:1
Valve Springs – Valve Spring Free Length – Yellow Stripe & Top	56.2 mm	2.21 in
Valve Springs – Valve Spring Installed Height – Yellow Stripe & Top	47.75 mm	1.88 in
Valve Springs – Valve Spring Load – Closed – Yellow Stripe & Top	400 N at 47.75 mm	90 lb at 1.9 in
Valve Springs – Valve Spring Load – Open – Yellow Stripe & Top	1345 N at 35.05 mm	302 lb at 1.38 in
Valve Springs – Valve Spring Free Length – Blue Stripe & Top	55.4 mm	2.18 in
Valve Springs – Valve Spring Installed Height – Blue Stripe & Top	47.75 mm	1.88 in
Valve Springs – Valve Spring Load – Closed – Blue Stripe & Top	410 N at 47.75 mm	92 lb at 1.9 in
Valve Springs – Valve Spring Load – Open – Blue Stripe & Top	1345 N at 35.05 mm	302 lb at 1.38 in