C 3500 Truck 2WD V8-454 7.4L (1990)
tab, the engine is in the number six firing position and should be turned over one more time to reach the number one position.
3. With the engine in the number one firing position as determined above, the following valves may be adjusted:
^
Exhaust: 1, 3, 4, 8.
^
Intake: 1,2, 5, 7.
(Even numbered cylinders are in the right bank; odd numbered cylinders are in the left bank, when viewed from the rear of the engine.)
4. Back out the adjusting nut until lash is felt at the pushrod then turn in the adjusting nut until all lash is removed. This can be determined by rotating
the pushrod while turning the adjusting nut. When the play has been removed, turn the adjusting nut in three quarters (3/4) additional turn (to
center the lifter plunger).
5. Crank the engine one revolution until the timing tab "0" mark and vibration damper mark are again in alignment. This is the number six firing
position; the following valves may be adjusted:
^
Exhaust: 2, 5, 6, 7.
^
Intake: 3, 4, 6, 8.
6. Install the rocker arm cover.
