Autolite 373 Spark Plug

Autolite 373 Copper Spark Plug Overview

Autolite 373 is a copper non-resistor spark plug built for quick starts, steady idle quality, and smooth throttle response. It uses an OE-style form, fit, and function approach for a wide range of foreign and domestic ignition applications, including common make/model search needs for Ford, Chevrolet, and Honda vehicles.

The Autolite Copper Non-Resistor Spark Plug line focuses on dependable ignition performance at a value-oriented price point. For drivers searching for an Autolite 373 spark plug replacement, this plug combines a copper center electrode, nickel tip materials, and a flat seat design for straightforward service in the correct application.

Key Features

• Autolite 373 copper spark plug with non-resistor design
• Copper center electrode core for consistent ignition transfer
• Nickel center and ground electrode tip materials
• Tapered ground electrode tip design with one ground electrode
• Pre-gapped at 0.025 in. / 0.60 mm
• Flat seat, 18.0 mm thread diameter, 19.5 mm reach
• 13/16 in. hex size with removable nut terminal
• Ceramic short insulator construction

Detailed Description

Autolite 373 is a standard copper spark plug engineered for OE-style ignition service where a non-resistor plug is specified. The copper core supports efficient spark delivery, while the nickel electrode materials and tapered ground design help maintain stable combustion performance in the correct engine application. If you are cross-shopping an Autolite 373 spark plug for Ford, Chevrolet, or Honda maintenance, this part number is commonly searched for routine tune-up work and ignition restoration.

This part cross-references Champion Spark Plug 204 for the same application. It also cross-references BT2, C81, and M24.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Slow throttle response during acceleration
• Reduced fuel economy from degraded ignition performance
• Misfire symptoms related to aged plug electrodes

Installation Notes and Tips

Verify the required thread diameter, reach, seat type, and resistor specification before installation. Autolite 373 uses a flat seat, 18.0 mm thread, 19.5 mm reach, and a non-resistor configuration, so it should only be installed where those specifications match the engine requirements. Check plug gap against the vehicle service specification before final installation, even though the plug is pre-gapped at 0.025 in. / 0.60 mm.

For fitment-based searches, this part is commonly referenced for Ford, Chevrolet, and Honda spark plug replacement needs when the engine calls for a copper non-resistor plug with these dimensions.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with a product line built around OE form, fit, and function. The 373 spark plug follows that service-focused approach for dependable replacement use in the correct application.