Denso 5044 Spark Plug

Denso 5044 U-Groove Spark Plug Overview

Denso 5044 is a conventional spark plug built for stable ignition performance in classic Chevrolet applications. Its U-Groove electrode design helps improve ignitability, supporting more efficient combustion in older engines that rely on consistent spark delivery.

This Denso U-Groove Conventional spark plug is a direct-fit option for select Chevrolet models, including Camaro, Corvette, Impala, and El Camino applications. The 5044 part number is also referenced as Denso Auto Parts W16S-U.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• Nickel ground electrode and nickel center tip materials
• Copper center electrode core for dependable conductivity
• Standard ground configuration with a flat seat
• Pre-gapped to 0.7 for installation consistency
• 14.00 mm thread diameter and 09.50 reach
• Manufacturer heat range 16
• 20.6 hex size for proper socket fit

Product Details

The Denso U-Groove Conventional line focuses on straightforward ignition service with a design that promotes better ignitability than a standard flat-ground layout. For owners searching for a spark plug for 1962-1970 Chevrolet Impala, 1967 Chevrolet Corvette, or 1968 Chevrolet Camaro, Denso 5044 provides the core dimensions and electrode construction needed for the listed applications. The copper core and nickel electrode materials support reliable spark transfer in secondary ignition systems.

This part cross-references Denso Auto Parts W16S-U for the same application.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or inconsistent spark plugs
• Rough idle from weak ignition output
• Misfire conditions related to degraded electrode surfaces
• Reduced combustion efficiency in aging ignition systems
• Maintenance replacement for factory-style Chevrolet ignition service

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the vehicle specification before installation. The pre-gap size is listed at 0.7, but final gap should always be checked during service to match engine requirements. Use the correct 20.6 mm hex socket and install to the proper torque for a flat-seat spark plug.

• Fits 1969-1970 Chevrolet El Camino, N/A
• Fits 1966 Chevrolet El Camino, N/A
• Fits 1969 Chevrolet Blazer, N/A
• Fits 1969 Chevrolet C10 Suburban, N/A
• Fits 1969 Chevrolet C20 Suburban, N/A
• Fits 1968-1969 Chevrolet K10 Suburban, N/A
• Fits 1969 Chevrolet K20 Suburban, N/A
• Fits 1968 Chevrolet Bel Air, N/A
• Fits 1968 Chevrolet Camaro, N/A
• Fits 1968 Chevrolet Caprice, N/A
• Fits 1966 Chevrolet Caprice, N/A
• Fits 1967 Chevrolet Corvette, N/A
• Fits 1962-1964 Chevrolet Impala, N/A

Quality Assurance

Denso manufactures ignition components to OE-level dimensional and material standards for consistent fit and service performance. Part number 5044 is built as a conventional replacement spark plug for the listed Chevrolet applications.