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ACDELCO 21
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$3.06
Price
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$0.00
Core
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+ Sold in packs of 1x1
Pack
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$3.06
Total
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| ACDELCO 21 Specifications |
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| Center Electrode Core Material | Copper | | Center Electrode Design | Standard | | Center Electrode Tip Material | Platinum | | Core Nose Length (IN) | 0.560 | | Electrical Terminal Type | Non-Removable Nut | | Ground Configuration | Standard | | Ground Electrode Core Material | Nickel | | Ground Electrode Tip Design | Standard | | Ground Electrode Tip Material | Nickel | | Height (IN) | 1.19 | | Hex Size (MM) | 16 | | Hex Type | Hex | | Indexed | No | | Indicated Mean Effective Pressure (IMEP) | 270 | | Insulator Height (in) | 2.047 | | Insulator Height (mm) | 52 | | Length (IN) | 4.13 | | Manufacturer Heat Range | 8 | | Pre-Gap Size (IN) | 0.045 | | Pre-Gap Size (MM) | 1.100 | | Reach (IN) | 1.043 | | Reach (mm) | 26.5 | | Resistor Type | Yes | | Seat Type | Flat | | Skirt | No | | Thread Diameter (IN) | 0.551 | | Thread Diameter (MM) | 14.0 | | Washer Included | Yes | | Washer Type | Crush | | Weight (lb) | 0.4 | | Width (IN) | 3.62 |
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| Professional; Rapidfire; Pre-Set Gap: 0.045" |
ACDelco Platinum Rapidfire® Spark Plugs are designed for everyday use and are a high quality replacement ideal for many vehicles on the road today. These spark plugs have high-quality suppressors that help prevent misfiring, an optimized plug to boot seal, and a pure copper core for great durability.
Features & Benefits:
- Solid state suppressor, with two-piece glass and brass seal, can help reduce radio frequency interference, regulates spark energy for long electrode life, and helps protect against high combustion pressures
- Pure copper core provides great heat transfer and helps maximize plug durability
- Platinum on center electrode enables superior spark characteristics and can reduce voltage requirements of the ignition system
- Ribless insulator helps optimize plug to boot seal
- Fits engines that run conventional plugs, as well as newer vehicles that require platinum plugs
 Which ACDELCO Spark Plug Is Right For You?
| Material / Series |
Lifespan / Durability |
Performance / Ignitability |
Efficiency / Fuel Economy |
Copper / Nickel
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★ |
★ |
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Platinum Rapidfire
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★★ |
★★ |
★★ |
Double Platinum
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★★★★ |
★★ |
★★ |
Iridium
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★★★ |
★★★★ |
★★★ |
ACDelco Quality ACDelco breaks down their premium portfolio of Original Equipment and Aftermarket parts into two tiers: GM Original Equipment and ACDelco Gold.
| GM ORIGINAL EQUIPMENT |
| GM Original Equipment parts are the true OE parts installed during production or validated by GM—designed, engineered, and tested to rigorous standards and backed by General Motors. |
| ACDELCO GOLD (PROFESSIONAL) |
| ACDelco Gold parts are the high-quality alternative to OE parts, manufactured to meet GM expectations for fit, form, and function and backed by General Motors. |
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