Engine Specifications

GENERAL SPECIFICATIONS

Year	Displ.		Carburetor	HP at RPM	Torque Ft. Lbs.@RPM	Compr. Ratio	Bore		Stoke
Year	cu. ins.	liters	Carburetor	HP at RPM	Torque Ft. Lbs.@RPM	Compr. Ratio	in.	mm	in.	mm
1982	454	7.4	4-Bbl.	.....	.....	8.5:1	4.250	107.95	4.000	101.6

VALVES

Engine & Valve

Head Diam. In. (mm)

Face Angle

Seat Angle

Seat Width In. (mm)

Stem Diameter In. (mm)

Stem Clearance In. (mm)

Valve Lift In. (mm)

7.4L

Int.

2.065

45°

46°

.031-.063

⁽¹⁾.3715-.3722

.0010-.0027

.398

(52.45)

(.787-1.60)

(9.44-9.45)

(.025-.069)

(10.11)

Ext.

1.720

45°

46°

.063-.094

⁽¹⁾.3713-.3720

.0012-.0029

.430

(43.69)

(1.60-2.39)

(9.43-9.45)

(.030-.074)

(10.92)

⁽¹⁾	Standard size valve specifications only. Always check stem clearance to determine valve guide and stem wear.

PISTONS, PINS, RINGS

Engine

PISTONS

PINS

RINGS

Clearance In. (mm)

Piston Fit In. (mm)

Rod Fit In. (mm)

Rings

End Gap In. (mm)

Side Clearance In. (mm)

7.4L

.003-.004

.0025-.0035

⁽¹⁾.0013-.0021

1

.010-.020

.0017-.0032

(.076-.102)

(.0064-.0089)

(.033-.053)

(.254-.508)

(.043-.081)

2

.010-.020

.0017-.0032

(.254-.508)

(.043-.081)

3

.015-.055

.005-.0065

(.381-1.397)

(.127-.165)

⁽¹⁾	Interference fit.

CRANKSHAFT MAIN & CONNECTING ROD BEARINGS

Engine

MAIN BEARINGS

CONNECTING ROD BEARINGS

Journal Diam. In. (mm)

Clearance In. (mm)

Thrust Bearing

Crankshaft End Play In. (mm)

Journal Diam. In. (mm)

Clearance In. (mm)

Side Play In. (mm)

7.4L

⁽¹⁾ 2.7481-2.7490

⁽¹⁾.0013-.0025

(69.80-69.82)

(.033-.064)

No. 5

.006-.010

2.1990-2.200

.0009-.0025

.013-.023

⁽²⁾ 2.7476-2.7486

⁽²⁾.0024-.0040

(.152-.254)

(55.85-55.88)

(.023-.064)

(.330-.584)

(69.79-69.81)

(.061-.102)

⁽¹⁾	Journal No. 1, 2, 3 & 4.

⁽²⁾	Journal No. 5.

CAMSHAFT

Engine		Journal In. (mm)	Clearance In. (mm)	Lobe Lift In. (mm)
7.4L
	Int.	1.9482-1.9492	.....	2343
		(49.48-49.50)	.....	(5.95)
	Exh.	1.9482-1.9492	.....	.2530
		(49.48-49.50)	.....	(6.43)

VALVE SPRINGS

Engine	Free. Length In. (mm)	PRESSURE Lbs. @ In. (kg @ mm)
Engine	Free. Length In. (mm)	Valve Closed	Valve Open
7.4L	2.12	84-96@1.80	210-230@1.40
7.4L	(53.85)	(38-44@45.72)	(95-104@35.56)