ENGINE DATA
Engine
5.4L V8 engine
6.8L V10 engine
Cubic inches
330
415
Required fuel
87 octane
87 octane
Firing order
1-3-7-2-6-5-4-8
1-6-5-10-2-7-3-8-4-9
Spark plug gap
1.0–1.1mm
(0.039–0.043 inch)
1.0–1.1mm
(0.039–0.043 inch)
Ignition system
Coil on plug
Coil on plug
Compression ratio
9.8:1
9.2:1
Drivebelt routing
5.4L V8/6.8L V10 engines
2009 F-250/350/450/550
(f23)
Owners Guide, 2nd Printing
USA
(fus)
Maintenance and Specifications
409