Firing Order

1-8-4-3-6-5-7-2

Ignition Timing - 454 and HT502

4° BTDC @ 650 RPM - Initial

26° @ WOT - Total

Ignition Timing - 502

10° BTDC @ 650 RPM - Initial

26° @ WOT - Total

Ignition Timing - 572

10° BTDC @ 950 RPM - Initial

26° @ 4000 RPM - Total

Spark Plug Torque - 454 and 502

30 N·m

22 lb ft

Spark Plug Torque - 572

34 N·m

25 lb ft

Firing Order

1-8-4-3-6-5-7-2

Ignition Timing - Except 350/290

10° BTDC @ 650 RPM - Initial

32° @ 4,000 RPM - Total

Ignition Timing - 350/290

10° BTDC @ 650 RPM - Initial

32° @ 3,000 RPM - Total

Spark Plug Torque

20 N·m

15 lb ft

Spark Plug Gap - Except 350/290

1.01 mm

0.040 in

Spark Plug Gap - 350/290

1.14 mm

0.045 in