General Motors — Valve Adjustment (5.0L and 5.7L Engines)

Adjustments · Valve train

From a General Motors service manual — check it applies to your exact model before use.

Procedure

1. Remove the rocker arm covers.
2. Crank the engine until the mark on the torsional damper lines up with the '0' mark on the timing tab (number one firing position).
3. Adjust exhaust valves 1, 3, 4, 8 and intake valves 1, 2, 5, 7.
4. Back out the adjusting nut until lash is felt at the pushrod, then turn in until all lash is removed.
5. Turn the adjusting nut in one full turn.
6. Crank the engine one revolution to the number six firing position.
7. Adjust exhaust valves 2, 5, 6, 7 and intake valves 3, 4, 6, 8.

Source: General Motors service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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