ENGINE DATA
Engine
4.2L V6 engine 4.6L V8 engine 5.4L V8 engine
Cubic inches
256
87 octane
Required fuel
Firing order
1-4-2-5-3-6
Ignition system
EDIS
0.052–0.056 inch
Spark plug gap
(1.32–1.42mm)
Compression
9.3:1
ratio
1
The 5.4L 3V spark plug gap can't be adjusted.
2
5.4L 3V FFV engines only.
Engine drivebelt routing
4.2L V6 Engine
2008 F-150
Owners Guide (post-2002-fmt)
USA
Maintenance and Specifications
281
87 octane
1-3-7-2-6-5-4-8
Coil on plug
0.052–0.056 inch
(1.32–1.42mm)
9.37:1
330
87 octane or
2
Ethanol (E85)
1-3-7-2-6-5-4-8
Coil on plug
0.040–0.050 inch
1
(1.02–1.28mm)
9.85:1
385