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)