NOS Autolite 646 Spark Plugs – Resistor Copper Core – USA Made

Description:

For sale: A complete box of 8 NOS Autolite 646 spark plugs featuring copper core and resistor design. Made in the USA under Allied-Signal’s aftermarket division, these plugs are ideal for vintage GM, Ford, and Chrysler applications. Cross-reference compatible with AC R45NSX, Champion RN14Y6, Motorcraft AGR52-6, and more. Perfect for restorers, collectors, or anyone seeking period-correct ignition components.

🔍 Part Number Details

• Primary Part Number: Autolite 646

• Type: Resistor, Copper Core

• Packaging: Box of 8 plugs

• Additional Markings: 2860853

• Branding: Autolite (Fram/Bendix), Allied-Signal Inc.

• Country of Origin: Made in the USA 🇺🇸

🚗 Fitment Examples

Autolite 646 plugs are designed for a wide range of domestic vehicles, especially from the 1980s–1990s. Based on the cross-reference numbers listed on the packaging, here are some fitment examples:

• GM vehicles using AC R45NSX plugs — common in 305/350 V8s

• Ford and Lincoln models using Motorcraft AGR52-6 — including 5.0L and 5.8L engines

• Chrysler and Jeep applications compatible with Champion RN14Y6

• Light trucks, SUVs, and marine engines with similar plug specs

Always confirm with a plug chart or service manual for exact fitment.

🔁 Cross Reference Equivalents

For deeper compatibility, this cross-reference database is a great resource.