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Autolite AR33 Spark Plug
| Brand | Autolite AR33 |
|---|---|
| Ground Electrode Tip Design | Tapered |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | 0.034 |
| Pre-Gap Size | 0.90 |
| Ground Electrode Quantity | 1 |
| Hex Size | 13/16" |
| Hex Size | 21 |
| Seat Type | Tapered |
| Reach | 0.433 |
| Reach | 11.0 |
| Thread Diameter | 18.0 |
| Resistor Type | No |
| Center Electrode Design | Standard / regular |
| Ground Electrode Tip Material | Nickel |
| Insulator Material | Ceramic |
| Product line | High Performance Racing Non-Resistor Spark Plug |
| Fits | AC · 1 vehicle |
Racing-focused design. Non-resistor construction for performance ignition systems.
OE-style fit. Form, fit, and function match common replacement needs.
Copper core. Nickel electrode materials support consistent spark delivery.
Cross-references Anchor 2127, Champion Spark Plug 409 and Continental 5012 for the same application. See all 4.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Autolite AR33 Racing Spark Plug
The Autolite AR33 is a high-performance racing spark plug built with a non-resistor design for strong ignition response. It uses OE-style form, fit, and function while adding racing-focused construction for demanding secondary ignition applications.
Key Features
- High Performance Racing Non-Resistor Spark Plug
- Copper center electrode core with nickel tip materials
- Tapered ground electrode tip and tapered seat design
- Pre-gapped to 0.034 in. / 0.90 mm
- Ceramic insulator with stud terminal connection
- 18 mm thread diameter, 0.433 in. reach, 13/16 in. hex
Detailed Description
Autolite AR33 spark plugs are engineered for performance-oriented ignition systems and are used in racing applications where consistent spark delivery matters. The copper core and nickel electrode materials support reliable conductivity, while the tapered ground electrode design and non-resistor construction suit high-output ignition setups. This Autolite spark plug is also positioned as an OE-style replacement, making it a practical choice for drivers who want a performance plug with familiar fitment characteristics. Fits 1966 AC 427, N/A. This part cross-references Champion Spark Plug 409 and Standard Ignition BF22 for the same application.
What It Helps Address
- Weak or inconsistent spark output in performance ignition systems
- Need for a non-resistor plug in racing-focused setups
- Replacement of worn spark plugs with OE-style dimensions
- Ignition service on a 1966 AC 427, N/A
Installation Notes and Tips
Verify thread diameter, reach, seat type, and terminal style before installation. The pre-gap is set at 0.034 in. / 0.90 mm, but final gap should always be checked against the engine specification. Use the correct torque procedure for tapered-seat spark plugs and confirm the ignition system is configured for a non-resistor plug. Fits 1966 AC 427, N/A.
Quality Assurance
Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and this AR33 follows OE form, fit, and function expectations for the listed application.
| Year | Make | Model | Notes |
|---|---|---|---|
| 1966 | AC | 427 | .025"/0.6mm; OE Style; High Performance Racing Non-Resistor Spark Plug |
| No rows match your filter. | |||