Description:

GM R42XLS Spark Plugs SOLD EACH

1. Cross-Reference Numbers

2. Specific Fitment

• Fits GM gasoline engines requiring a 14 mm thread, 19.05 mm reach and 0.035″ gap.

• Common applications:

  • Chevy Camaro (1967–1992) V8

  • Chevrolet Corvette (1980–1992) 5.7 L V8

  • Chevy C/K Trucks (1981–1991) 5.7 L V8

  • Buick, Oldsmobile, Pontiac V8 engines of the ’70s–’90s

• Ideal for restorations seeking OE-correct spark performance.

Product Description

ACDelco R42XLS is the genuine GM original-equipment conventional spark plug, engineered for reliability and factory-correct performance. Each plug features a copper core for superior heat transfer, nickel-chrome tip for corrosion resistance, and a ribbed insulator nose to suppress flash-over. Preset to a precise 0.035″ gap, these plugs deliver consistent firing in V8 and high-compression engines. Backed by a 12 month/12,000 mile limited warranty, they’re perfect for restoration-grade projects and daily drivers alike.

Specifications

4. Why Choose R42XLS?

• OE-certified by GM for original fit, form and function

• Copper core for rapid heat transfer and extended service life

• Ribbed insulator nose and nickel-chrome sheathing to prevent misfire and corrosion

• Preset gap ensures out-of-box installation with no guesswork