Engine Specifications
GENERAL SPECIFICATIONS
| Year |
Displ. Cu. Ins. |
Carburetor |
HP at RPM |
Torque (Ft. Lbs. at RPM) |
Compr. Ratio |
Bore |
Stroke |
| 1981 |
454" |
4-Bbl. |
..... |
..... |
8.5:1 |
4.250" |
4.000" |
VALVES
| Engine & Valve |
Head Diam. |
Face Angle |
Seat Angle |
Seat Width |
Stem Diameter |
Stem Clearance |
Valve Lift |
| 7.4L |
|
|
|
|
|
|
|
| |
Int. |
2.065" |
45° |
46° |
.031-.063" |
.3715-.3722" |
.0010-.0027" |
.398" |
| Exh. |
1.720" |
45° |
46° |
.063-.094" |
.3713-.3720" |
.0012-.0029" |
.430" |
PISTONS, PINS, RINGS
| Engine |
PISTONS |
PINS |
RINGS |
| Clearance |
Piston Fit |
Rod Fit |
Rings |
End Gap |
Side Clearance |
| 7.4L |
.003-.004" |
.00025-.00035" |
.0013-.0021" |
1 |
.010-.020" |
.0017-.0032" |
| 2 |
.010-.020" |
.0017-.0032" |
| 3 |
.015-.055" |
.005-.0065" |
CRANKSHAFT MAIN & CONNECTING ROD BEARINGS
| Engine |
MAIN BEARINGS |
CONNECTING ROD BEARINGS |
| Journal Diam. |
Clearance |
Thrust Bearing |
Crankshaft Endplay |
Journal Diam. |
Clearance |
Sideplay |
| 7.4L |
2.7481-2.7490" |
.0013-.0025" |
No. 5 |
.006-.010" |
2.1990-2.200" |
.0009-.0025" |
.013-.023" |
| 2.7476-2.7486" |
.0024-.0040" |
VALVE SPRINGS
| Engine |
Free Length |
PRESSURE (LBS.) |
| Valve Closed |
Valve Open |
| 7.4L |
2.12" |
84-96@1.80" |
210-230@1.40" |
CAMSHAFT
| Engine |
Journal Diam. |
Clearance |
Lobe Lift |
| 7.4L |
|
|
|
| |
Int. |
1.9482-1.9492" |
..... |
.2343" |
| Exh. |
1.9482-1.9492" |
..... |
.2530" |