Description:
The ACDelco R42XLS GM Original Equipment Conventional Spark Plug is engineered and validated by General Motors to deliver reliable ignition performance and efficient engine operation. Designed as an OE replacement, this spark plug meets rigorous GM standards for fit, form, and function.

A copper core center electrode provides excellent heat transfer to help maintain optimal operating temperatures and maximize durability. The Black Onyx coating helps reduce corrosion, while the ribbed suppressor seal helps prevent spark flashover and misfires. Nickel-chrome alloy sheathing protects the center electrode from corrosion, supporting long service life and consistent ignition performance.

ACDelco GM Original Equipment spark plugs are the same parts installed during vehicle production or validated by General Motors for GM vehicles, making them a dependable choice for maintenance and replacement.

Features:

• GM Original Equipment spark plug engineered and validated by General Motors

• Copper core center electrode improves heat transfer and durability

• Black Onyx coating helps reduce corrosion

• Ribbed suppressor seal helps prevent spark flashover and misfires

• Nickel-chrome alloy sheathing helps protect the center electrode

• Designed for reliable ignition and efficient engine performance

• Suitable for select automotive and marine applications

Product Specifications:

• Part number: R42XLS

• Product line: ACDelco GM Original Equipment

• Center electrode core material: Copper

• Center electrode tip material: Nickel alloy

• Center electrode design: Standard

• Ground electrode configuration: Standard

• Ground electrode quantity: 1

• Thread diameter: 14 mm (0.55 in)

• Seat type: Flat

• Reach: 0.75 in (19.05 mm)

• Hex size: 13/16 in (20.62 mm)

• Resistor type: Yes

• Pre-gap size: 0.04 in (0.89 mm)

• Manufacturer heat range: 2

• Insulator material: ES703

• Insulator height: 2.22 in (56.49 mm)

• Washer type: Crush washer

• Washer included: Yes

• Package quantity: 1