Description
The ACDelco Gold (Professional) R44T is a conventional copper-core spark plug built for reliable ignition performance and OE-style fit. It is designed as a premium aftermarket replacement for many GM and other older gasoline applications, including light trucks, vans, and commercial vehicles.
Its copper core helps transfer heat efficiently, while the Black Onyx coating helps resist corrosion. This plug is pre-gapped and intended for dependable day-to-day service in engines originally designed for conventional plugs.
Key Features
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Copper core for strong heat transfer and durability
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Black Onyx coating helps reduce corrosion
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Resistor spark plug for suppression characteristics and reliable performance
- Pre-gapped from the factory
- Tapered seat design
- Suitable for many GM and legacy applications, including some marine use cases
Specifications
General
- Part Number: R44T
- Brand: A.C. Delco
- Plug Type: Conventional / Copper Core
- Grade Type: Regular
Dimensions
- Thread Diameter: 14 mm
- Reach: 0.43 in / 10.92 mm
- Hex Size: 5/8 in / 15.88 mm
- Seat Type: Tapered
Electrical / Electrode
- Terminal Type: Non-Removable Nut
- Resistor Type: Yes
- Center Electrode Core: Copper
- Center Electrode Tip Material: Nickel Alloy
- Ground Electrode Core Material: Nickel
- Ground Electrode Quantity: 1
- Center Electrode Design: Standard
Gap / Heat Range
- Pre-Gap: 0.040 in / 1.02 mm
- Manufacturer Heat Range: 4
Fitment Overview
This plug fits a very large range of older GM vehicles and work trucks, including many:
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Chevrolet C/K trucks, Blazer, G-series vans, P-series step vans, El Camino
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GMC C/K trucks, Jimmy, G-series vans, P-series vans, Caballero, Sprint
- Selected Oldsmobile and Pontiac older inline-6/V8 applications
Typical fitment spans many 1970s–1990s GM trucks, vans, and commercial chassis with engines such as:
- L6 4.1L / 4.8L
- V8 5.0L / 5.7L / 6.6L / 7.4L
FAQ Highlights
From the product details:
- Spark plug change intervals depend on the vehicle and plug type
- Replace all spark plugs at the same time
- These plugs are pre-gapped
- Dirty or worn plugs should generally be replaced, not cleaned
- Worn plugs can cause misfire, poor fuel economy, sluggish performance, and hard starting
Summary
The ACDelco R44T is a solid conventional copper-core replacement spark plug for many older GM engines. It is best suited to applications that originally used standard plugs and is a practical choice for reliable everyday performance rather than extended-life iridium/platinum service intervals.
