Ignitions and Electrical Ignition Components

Autolite

RACING SPARK PLUG

$19.78

SKU: A035 AR3933-01

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Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

The Autolite AR3933-01 is a racing spark plug designed for high-performance applications. It features a copper core electrode for enhanced ignitibility and faster flame kernel growth. The plug has a gasket seat style with a 14mm thread size and a 0.750 in. reach.

These spark plugs are constructed with an Yttrium-enhanced alloy, which helps reduce side wire temperatures, leading to improved durability and less pre-ignition. They are available in colder heat ranges to accommodate modified engines and feature a nickel-plated finish for corrosion resistance and longevity.

Fitment

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandAutolite
Part NumberA035 AR3933-01

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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