Installation Procedure

Fig 1: View Of Spark Plug And Sparkplug Seat

Courtesy of GENERAL MOTORS CORP.

Inspect each spark plug gap. Adjust each plug as needed.
Specification: Spark plug gap: 1.524 mm (0.060 in).
Hand start the spark plugs in the corresponding cylinders.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Tighten the spark plugs.
Tighten:
- For used heads, tighten the spark plugs to 15 N.m (11 lb ft).
- For new aluminum heads, tighten the spark plugs to 20 N.m (15 lb ft).
- For new iron heads, tighten the spark plugs to 30 N.m (22 lb ft).
Install the spark plug wires. Refer to Spark Plug Wire Replacement .