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General Engine Specifications

GENERAL SPECIFICATIONS

Application Specification
Displacement 275 Cu. In. (4.5L)
Bore 3.66" (93.0 mm)
Stroke 3.26" (82.8 mm)
Compression Ratio 10.2:1
Fuel System MFI
Horsepower @ RPM 278 @ 6000
Torque Ft. Lbs. @ RPM 292 @ 4000
CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS

Application In. (mm)
Crankshaft
End Play
Standard .004-.010 (.10-.25)
Wear Limit .012 (.30)
Maximum Runout .002 (.05)
Main Bearings
Journal Diameter (1)
Grade Number "0" 2.5180-2.5183 (63.958-63.964)
Grade Number "1" 2.5178-2.5180 (63.952-63.958)
Grade Number "2" 2.5176-2.5178 (63.946-63.952)
Grade Number "3" 2.5173-2.5176 (63.940-63.946)
Journal Out-Of-Round & Taper .0002 (.005)
Oil Clearance
Standard .0005-.0012 (.012-.030)
Wear Limit .0020 (.050)
Connecting Rod Bearings
Journal Diameter (1)
Grade Number "0" 2.0460-2.0462 (51.968-51.974)
Grade Number "1" 2.0457-2.0460 (51.962-51.968)
Grade Number "2" 2.0455-2.0457 (51.956-51.962)
Journal Out-Of-Round & Taper .0002 (.005)
Oil Clearance
Standard .0008-.0018 (.020-.045)
Wear Limit .0026 (.065)
(1) Diameter is determined by grade number stamped on crankshaft. See Figure .
CONNECTING RODS

Application In. (mm)
Bore Diameter
Pin Bushing Bore .8661-.8666 (22.000-22.012)
Crankpin Bore 2.1654-2.1659 (55.000-55.013)
Center-To-Center Length 5.7854-5.7894 (146.950-147.050)
Maximum Bend .0059 Per 3.94 (.150 Per 100.1)
Maximum Twist .012 Per 3.94 (.30 Per 100.1)
Side Play
Standard .0079-.0138 (.200-.350)
Wear Limit .0157 (.400)
PISTONS, PINS & RINGS

Application In. (mm)
Pistons
Clearance .0004-.0012 (.010-.030)
Diameter (1)
Grade Number "1" 3.6606-3.6610 (92.980-92.990)
Grade Number "2" 3.6610-3.6614 (92.990-93.000)
Grade Number "3" 3.6614-3.6618 (93.000-93.010)
Pins
Diameter .8657-.8662 (21.989-22.001)
Piston Fit (2)
Rod Fit
Standard .0002-.0007 (.005-.017)
Wear Limit .0009 (.023)
Rings
No. 1
End Gap
Standard .0106-.0181 (.270-.460)
Wear Limit .040 (1.0)
Side Clearance
Standard .0016-.0031 (.040-.080)
Wear Limit .004 (.10)
No. 2
End Gap
Standard .0154-.0248 (.390-.630)
Wear Limit .040 (1.0)
Side Clearance
Standard .0012-.0028 (.030-.070)
Wear Limit .004 (.10)
No. 3 (Oil)
End Gap
Standard .0079-.0272 (.200-.690)
Wear Limit .040 (1.0)
(1) Piston diameter is determined by grade number stamped on top of piston. See Figure .
(2) Interference fit is .0002" (.005 mm). Piston pin hole inside diameter should be .8656-.8661" (21.987-21.999)
CYLINDER BLOCK

Application In. (mm)
Cylinder Bore
Standard Diameter (1)
Grade Number "1" 3.6614-3.6618 (93.000-93.010)
Grade Number "2" 3.6618-3.6622 (93.010-93.020)
Grade Number "3" 3.6622-3.6626 (93.020-93.030)
Maximum Taper .0004 (.010)
Maximum Out-Of-Round .0006 (.015)
Main Bearing Bore Inside Diameter (1)
Grade Number "0" 2.7143-2.7146 (68.944-68.950)
Grade Number "1" 2.7146-2.7148 (68.950-68.956)
Grade Number "2" 2.7148-2.7150 (68.956-68.962)
Grade Number "3" 2.7150-2.7153 (68.962-68.968)
Maximum Deck Warpage (2) .004 (.10)
(1) Diameter is determined by grade number stamped on cylinder block. See Figure .
(2) Maximum resurfacing limit of cylinder block and cylinder head combined is .008" (.20 mm).
VALVES & VALVE SPRINGS

Application Specification
Intake Valves
Face Angle 45.5°
Head Diameter 1.496-1.508" (38.00-38.30 mm)
Minimum Margin .020" (.50 mm)
Valve Length 4.0039-4.0276" (101.700-102.300 mm)
Stem Diameter .2743-.2744" (6.966-6.971 mm)
Valve Tip Maximum Refinish .008" (.20 mm)
Exhaust Valves
Face Angle 45.5°
Head Diameter 1.299-1.307" (33.00-33.20 mm)
Minimum Margin .020" (.50 mm)
Valve Length 4.0205-4.0441" (102.120-102.720 mm)
Stem Diameter .3134-.3136" (7.960-7.965 mm)
Valve Tip Maximum Refinish .008" (.20 mm)
Valve Springs
Free Length
1995 1.863" (47.31 mm)
1996 1.946" (49.42 mm)
Out-Of-Square .081" (2.06 mm)
Lbs. @ In. (kg @ mm) 
Pressure
Intake & Exhaust 120.4 @ 1.06 (54.6 @ 26.8)
CYLINDER HEAD

Application Specification
Cylinder Head
Height 5.146-5.154" (130.70-130.90 mm)
Maximum Warpage (1) .004" (.10 mm)
Valve Seats
Intake
Seat Angle 45°
Seat Width .0445-.0500" (1.13-1.27mm)
Exhaust
Seat Angle 45°
Seat Width .0571-.0583" (1.45-1.48 mm)
Valve Guides
Intake Valve
Valve Guide Cylinder Head Bore I.D.
Standard .4321-.4329" (10.975-10.996 mm)
Oversize .4400-.4408" (11.175-11.196 mm)
Valve Guide I.D. .2756-.2763" (7.000-7.018 mm)
Valve Guide Installed Height .6752-.6831" (17.15-17.35 mm)
Valve Guide O.D.
Standard .4340-.4344" (11.023-11.034 mm)
Oversize .4418-.4423" (11.222-11.234 mm)
Valve Stem-To-Guide Oil Clearance
Standard .0011-.0020" (.029-.050 mm)
Wear Limit .0031" (.080 mm)
Exhaust Valve
Valve Guide Cylinder Head Bore I.D.
Standard .4715-.4723" (11.975-11.996 mm)
Oversize .4793-.4802" (12.175-12.196 mm)
Valve Guide I.D. .3150-.3154" (8.000-8.011 mm)
Valve Guide Installed Height .6752-.6831" (17.15-17.35 mm)
Valve Guide O.D.
Standard .4733-.4738" (12.023-12.034 mm)
Oversize .4812-.4817" (12.223-12.234 mm)
Valve Stem-To-Guide Oil Clearance
Standard .0014-.0020" (.035-.050 mm)
Wear Limit .0031" (.080 mm)
(1) Maximum resurfacing limit of cylinder block and cylinder head combined is .008" (.20 mm).
CAMSHAFT

Application In. (mm)
Bore Diameter 1.0236-1.0244 (26.000-26.021)
End Play
Standard .0028-.0058 (.070-.148)
Wear Limit .0079 (.200)
Journal Diameter 1.0211-1.0218 (25.935-25.955)
Journal Runout .002 (.05)
Lobe Height (1)
1995
Intake 1.4929-1.5004 (37.919-38.109)
Exhaust 1.3889-1.3964 (35.279-35.469)
1996
Intake 1.4856-1.4931 (37.734-37.924)
Exhaust 1.3841-1.3915 (35.155-35.345)
Oil Clearance
Standard .0018-.0034 (.045-.086)
Wear Limit .0059 (.150)
(1) Maximum wear limit on lobe height is .002" (.05 mm).
LASH ADJUSTER

Application In. (mm)
Bore Diameter .6693-.6701 (17.000-17.020)
Adjuster Diameter .6685-.6690 (16.980-16.993)
Oil Clearance .0003-.0016 (.007-.040)
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