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: 1.016 mm (0.040 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 cylinder head - New - Tighten the spark plugs to 20 N.m (15 lb ft).
- For cylinder head - all subsequent installations - Tighten the spark plugs to 15 N.m (11 lb ft).
Install the spark plug wires. Refer to Spark Plug Wire Replacement .
Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 5.7L.