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Section 4 (6.1L Engine (Service Information)): Specifications: General

WARNING: This page is about a different variant/trim than selected.
GENERAL DESCRIPTION

DESCRIPTION SPECIFICATION
Engine Type 90° V-8 OHV
Displacement 6.1 Liters
370 (Cubic Inches)
Bore 103 mm (4.055 in.)
Stroke 90.9 mm (3.58 in.)
Compression Ratio 10.3:1
Firing Order 1-8-4-3-6-5-7-2
Lubrication Pressure Feed - Full Flow
- Filtration
Cooling System Liquid Cooled - Forced
- Circulation
Cylinder Block Cast Iron
Cylinder Head Aluminum
Crankshaft Forged Steel
Camshaft Hollow Assembled Camshaft
Pistons Aluminum Alloy
Connecting Rods Powdered Metal
CYLINDER BLOCK

DESCRIPTION SPECIFICATION
Metric Standard
Cylinder Bore Diameter 103 mm 4.055 in.
Out of Round (MAX) 0.008 mm 0.0003 in.
Taper (MAX) 0.0127 mm 0.0005 in.
Lifter Bore Diameter 21.45 - 21.425 mm 0.8444 - 0.8435 in.
PISTONS

DESCRIPTION SPECIFICATION
Metric Standard
Clearance 0.0245 - 0.0515 mm 0.00096 - 0.0020 in.
Measured at 38.0 mm (1.5 in.) Below Deck
Ring Groove Diameter
Groove #1 93.1 - 93.4 mm 3.665 - 3.677 in.
Groove #2 91.6 - 91.8 mm 3.606 - 3.614 in.
Weight 435 grams 15.34 oz.
Piston Length 54.70 - 55.30 2.153 - 2.177 in.
Ring Groove Width 
No. 1 1.51 - 1.54 mm 0.0594 - 0.0606 in
No. 2 1.51 - 1.53 mm 0.0594 - 0.0602 in.
No. 3 3.030 - 3.055 mm 0.1192 - 0.1202 in.
PISTON PINS

DESCRIPTION SPECIFICATION
Metric Standard
Clearance In Piston 0.006 - 0.015 mm 0.00023 - 0.00059 in.
Diameter 25.0 - 25.003 mm 0.9843 - 0.9844 in.
Length 64.785 - 65.215 mm 2.551 - 2.568 in.
PISTON RINGS

DESCRIPTION SPECIFICATION
Metric Standard
Ring Gap 
Top Compression Ring 0.30 - 0.40 mm 0.0118 - 0.0157 in.
Second Compression Ring 0.35 - 0.60 mm 0.0137 - 0.0236 in.
Oil Control (Steel Rails) 0.20 - 0.71 mm 0.0079 - 0.028 in.
Side Clearance  -
Top Compression Ring .02 -.068 mm 0.0007 - 0.0026 in.
Second Compression Ring 0.02 - 0.058 mm 0.0007 - 0.0022 in.
Oil Ring (Steel Ring) 0.019 - 0.229 mm 0.0007 - 0.0091 in.
Ring Width 
Top Compression Ring 1.472 - 1.490 mm 0.0579 - 0.0586 in.
Second Compression Ring 1.472 - 1.490 mm 0.0579 - 0.0586 in.
Oil Ring (Steel Rails) 0.447 - 0.473 mm 0.0175 - 0.0186 in.
CONNECTING RODS

DESCRIPTION SPECIFICATION
Metric Standard
Piston Pin Bore Diameter 23.955 - 23.975 mm 0.9431 - 0.9438 in.
Side Clearance 0.10 - 0.35 mm 0.003 - 0.0137 in.
CRANKSHAFT

DESCRIPTION SPECIFICATION
Metric Standard
Main Bearing Journal Diameter 64.988 - 65.012 mm 2.5585 - 2.5595 in.
Bearing Clearance 0.023 - 0.051 mm 0.0009 - 0.002 in.
Out of Round (MAX) 0.005 mm 0.0002 in.
Taper (MAX) 0.003 mm 0.0001 in.
End Play 0.052 - 0.282 mm 0.002 - 0.011 in.
End Play (MAX) 0.282 mm 0.011 in.
Connecting Rod Journal Diameter 53.992 - 54.008 mm 2.125 - 2.126 in.
Bearing Clearance 0.020 - 0.074 mm 0.0007 - 0.0029 in.
Out of Round (MAX) 0.005 mm 0.0002 in.
Taper (MAX) 0.003 mm 0.0001 in.
CAMSHAFT

DESCRIPTION SPECIFICATION
Metric Standard
Bearing Journal Diameter - -
No. 1 58.2 mm 2.29 in.
No. 2 57.8 mm 2.27 in.
No. 3 57.4 mm 2.26 in.
No. 4 57.0 mm 2.24 in.
No. 5 43.633 mm 1.72 in.
Bearing To Journal Clearance Standard
No. 1 0.040 - 0.080 mm 0.0015 - 0.003 in.
No. 2 0.050 -0.090 mm 0.0019 - 0.0035 in.
No. 3 0.040 - 0.080 mm 0.0015 - 0.003 in.
No. 4 0.050 - 0.090 mm 0.0019 - 0.0035 in.
No. 5 0.040 - 0.080 mm 0.0015 - 0.003 in.
Camshaft End Play .080 - 0.290 mm 0.0031 - 0.0114 in.
VALVE TIMING @ SAE 0.006"

DESCRIPTION SPECIFICATION
Intake 
Opens (BTDC) 15.0°
Closes (ATDC) 268.0°
Duration 283.0°
Exhaust 
Opens (BTDC) 251°
Closes (ATDC) 35°
Duration 286.0°
Valve Overlap 50°
CYLINDER HEAD

DESCRIPTION SPECIFICATION
Valve Seat Angle 44.5° - 45.0°
Valve Seat Runout (MAX) 0.05 mm (0.0019 in.)
Valve Seat Width (Finish)
Intake 1.18 - 1.62 mm
- (0.0464 - 0.0637 in.)
Exhaust 1.48 - 1.92 mm
- (0.0582 - 0.0755 in.)
Guide Bore Diameter (Std.) 7.975 - 8.00 mm
- (0.313 - 0.314 in.)
HYDRAULIC TAPPETS

DESCRIPTION SPECIFICATION
Metric Standard
Body Diameter 21.387 - 21.405 mm 0.8420 - 0.8427 in.
Clearance (To Bore) 0.020 - 0.063 mm 0.0007 - 0.0024 in.
Dry Lash 3.0 mm (at the valve) 0.1181 in.
VALVES

DESCRIPTION SPECIFICATION
Face Angle -
Intake 45.5° - 46.0°
Exhaust 45.0° - 45.5°
Head Diameter
Intake 52.67 - 52.93 mm
(2.07 - 2.08 in.)
Exhaust 40.37 - 40.63 mm
(1.57 - 1.60 in.)
Length (Overall From Gage Line)
Intake 124.38 - 124.76 mm
(4.897 - 4.912 in.)
Exhaust 122.47 - 122.85 mm
(4.822 - 4.837 in.)
Stem Diameter
Intake 7.734 - 7.954 mm
(0.312 - 0.313 in.)
Exhaust 7.930 - 7.950 mm
(0.312 - 0.313 in.)
Stem - to - Guide Clearance
Intake 0.021 - 0.066 mm
- (0.0008 - 0.0025 in.)
Exhaust 0.025 - 0.070 mm
- (0.0010 - 0.0028 in.)
Valve Lift (@ Zero Lash)
Intake 14.5 mm (0.571 in.)
Exhaust 14.0 mm (0.551 in.)
VALVE SPRING

DESCRIPTION SPECIFICATION
Spring Force (Valve Closed)
Intake 445.0 N +/- 22.0 N @ 47.5 mm
(99.0 lbs +/- 4.0 - 9.0 lbs. @ 1.870 in.)
Exhaust 445.0 N +/- 22.0 N @ 45 mm
(99.0 lbs +/- 4.0 - 9.0 lbs. @ 1.772 in.)
Spring Force (Valve Open) -
Intake 1450.0 N +/- 68.0 N @ 33.0 mm
(325.5 lbs. +/- 15.3 lbs. @ 1.3 in.)
Exhaust 1450.0 N +/- 68.0 N @ 31.0 mm
(325.5 lbs. +/- 15.3 lbs. @ 1.22 in.)
Free Length (approx) -
Intake 54.2 mm (2.133 in.)
Exhaust 51.4 mm (2.023 in.)
Number of Coils
Intake 7.35
Exhaust 7.0
Wire Diameter
Intake and Exhaust 5.65 x 4.51 mm
- (0.222 - 0.178 in.)
Installed Height (Spring Seat to Bottom of Retainer)
Intake 47.5 mm (1.870 in.)
Exhaust 45.0 mm (1.772 in.)
OIL PUMP

DESCRIPTION SPECIFICATION
Clearance Over Rotors (MAX) 0.095 mm (0.0038 in.)
Outer Rotor to Pump Body Clearance (MAX) 0.235 mm (0.009 in.)
Tip Clearance Between Rotors (MAX) 0.150 mm (0.006 in.)
OIL PRESSURE

SPECIFICATION SPECIFICATION
At Curb Idle Speed (MIN)* 25 kPa (4 psi)
@ 3000 RPM 170 - 758 kPa (25 - 110 psi)
* CAUTION: If pressure is zero at curb idle, DO NOT run engine 
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