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Autolite 3924 Copper Resistor Automotive Replacement Spark Plugs (4 Pack)

Free shipping on orders over $29.99

$8.92

$ 4 .99 $4.99

In Stock

1.Size:1 Count (pack Of 2)


2.:4


About this item

  • MAXIMUM PERFORMANCE: Every Copper Spark Plug has a full copper core electrode which provides higher thermal conductivity for better performance in all conditions
  • IMPROVED DURABILITY: All Autolite spark plugs are Leak proof and come with a heat fused internal seal for long lasting durability
  • CONSTRUCTION: These replacement spark plugs have a copper-glass seal which bonds the insulator and the terminal post center electrode together
  • FUEL EFFICIENCY: The Autolite copper automotive replacement spark plug are guaranteed to deliver quick starts, better fuel economy and smooth acceleration
  • AUTOLITE ADVANTAGE: Since 1936, Autolite has been a trusted leader and innovator in spark plug technology. You can count on our copper plugs for performance and value, backed by decades of experience and passion


Autolite Copper Core Spark Plugs deliver quick starts, good fuel economy, and smooth acceleration. The copper-glass seal bonds insulator and terminal post center electrode together to ensure full required voltage at spark gap, creating a gas-tight seal that is 100 percent leak-proof. Copper Core spark plugs feature a cold-formed steel shell and precision rolled threads, and a one-piece terminal post that adds strength. The multi-rib insulator reduces the danger of "flash-over" to prevent misfires, and the resistor reduces radio frequency interference (RFI) and electrode erosion. The full copper core electrode provides better performance in all conditions. Autolite Copper Core plugs are your industry standard.


walt babrowicz
Reviewed in the United States on February 7, 2025
What I wanted fast delivery
DANIEL OSAFO
Reviewed in the United States on February 12, 2025
These engine plug works like magic I will buy more for future use
gary e bedell
Reviewed in the United States on January 7, 2025
Even though the plug looked old you could hardly read the writing on the porcelain not sure why.the plug still works great
Customer
Reviewed in the United States on January 16, 2025
My lawn mower was getting hard to start. I thought it might be the fuel or carb. But turned out the spark plug was bad. Put the new plug in and my mower now starts on the first or second pull and runs like new. Easy and inexpensive fix. I would buy again when needed.
Anonymous
Reviewed in the United States on September 23, 2024
Replaced and engine fired right up, excellent price half the cost of automotive stores. These plugs are gritty and get the job done for all small block fords.
Patrick Laflamme
Reviewed in Canada on June 27, 2024
Trusted brand for many years so no complaint to make here.
Tom
Reviewed in Canada on June 24, 2024
Everything worked out perfect thank you.
Samuel Pérez
Reviewed in the United States on December 2, 2024
Bujias medianamente buenas, al tiempo suelen presentar fallas, duran menos que la competencia.
C. Lang
Reviewed in the United States on November 23, 2024
U can buy expensive plugs that actually don't work as good. Depending on the motor as some engines don't like iridium plugs and will actually hurt gas mileage and performance.
Brooke Williams
Reviewed in the United States on October 16, 2024
Perfect fit!
Coco
Reviewed in Canada on April 9, 2024
Pour mon auto
Daryll G. Horvath
Reviewed in Canada on November 27, 2023
Put these plugs in my 347 Stroker. Since the engine block is an older 302 block with AFR heads, it’s better to use coppers instead of Platinums and Iridiums which are normally fit the new modern boosted motors.
End User
Reviewed in Canada on October 31, 2021
I bought these because they are cheap Old School .... if you change your plugs yourself every 30,000 to 50,000 klms these are certainly the way to go .... if you pay someone $115.00 per hour to do it ... not so much buy the more expensive iridium or platinum tip ..