Is AC Delco a good spark plug?

ACDelco Professional Iridium Spark Plugs are the high quality replacement ideal for many vehicles on the road today. Iridium composition provides a high melting point and great strength, and provides excellent wear resistance and durability.

What do the numbers mean on a AC Delco spark plug?

Numbering: · 1st number denotes thread size. · 2nd number denotes heat range. In the early 1990s, an all-numeric, identification code was developed to ensure that the proper spark plug would be selected for replacement in specific engine applications.

What’s the best spark plug for performance?

Iridium. The best spark plugs on the market boast an iridium construction. Iridium spark plugs give you even better gas mileage, performance, reliability, and longevity than double-platinum plugs.

Who makes Autolite?


Type Division of FRAM Group
Founded 1911
Headquarters Lake Forest, Illinois , United States
Parent FRAM Group IP LLC

Who makes ACDelco spark?

General Motors (GM)
ACDelco is an American automotive parts brand owned by General Motors (GM). Factory parts for vehicles manufactured by GM are consolidated under the ACDelco brand, which also offers aftermarket parts for non-GM vehicles.

Are Autolite spark plugs pre gapped?

Autolite® and all spark plug manufacturers offer spark plugs pre-gapped in the most popular gap sizes. Because of the many gap sizes required, no one offers spark plugs properly gapped for every application. Gapping has always been the job of the installer.

Are Autolite Iridium plugs good?

Elite. These spark plugs are one of the brand’s most technologically advanced spark plugs ever. With an iridium-enhanced 0.6 mm finewire design and proprietary platinum sidewire technology, these spark plugs provide better durability and a more focused ignition for better overall ignitability and optimum performance.

Will a hotter spark plug stop fouling?

Rich air/fuel ratios require a hotter plug to prevent fouling. Mixtures that cause the plugs to read lean may contribute to pre-ignition or detonation. The higher the compression ratio, the colder the spark plug needs to be.

What happens if you use a hotter spark plug?

A “hot” spark plug has a longer insulator that prevents heat transfer into the water jackets. It keeps more heat in the tip of the spark plug, which helps burn off combustion chamber deposits. But if there’s too much retained heat, the engine will experience preignition.

Are Autolite spark plugs OEM?

Autolite products became standard original factory equipment in Ford vehicles.