NGK Racing Spark Plug Box of 4 (UR4IX)
NGK Racing Spark Plug Box of 4 (UR4IX)
A$78.21
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Description
NGK Racing Spark Plug Box of 4 (UR4IX)
NGK Racing Series plugs are engineered to withstand the harshest engine conditions.
Additional Information
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability.
Application Summary
CHECKER 1978-70; CHEV 1993-70; CHR/DOD/PLY 1987-74; FORD/LIN/MERC 1996-69; GM 1993-67; JEEP 1971-69, I/O - 2000-99 KODIAK, 1998-78 OMC, PE ENGINES - HON, KOHLER, MITS, SUBARU-ROBIN, OPE - VARIOUS
Part Type
Spark Plug
Product Overview
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.
| Additional Application Notes | |
|---|---|
| • Gap 0.040" | |
| • Gap 0.045" | |
| • Gap 0.030" | |
| • Gap 0.035" | |
| • Gap 0.035" 250 HP | |
| • Light Duty Gap 0.035" | |
| • Light Duty Gap 0.045" | |
| • Gap 0.035" Cast Iron Heads | |
| • Gap 0.045" Cast Iron Heads | |
| • Gap 0.035" 425 HP | |
| • Gap 0.044" | |
| • Gap 0.034" | |
| • Gap 0.034" 14mm Heads | |
| • Gap 0.034" Cleveland Engine | |
| • H.O. Gap 0.044" | |
| • Gap 0.044" California Emissions | |
| • Gap 0.044" Federal Emissions | |
These additional application notes are supplied by the manufacturer and collated from multiple year ranges. Not all of these notes may apply to every year or every variant. Please contact a StreetFX agent for clarification if required.
Data: v2 - Desc: v4.2 - Upd: 2026-11-08 06:18:20
Features
- Copper core aids in heat removal
- Corrugated ribs prevent flashover
- Pure alumina silicate ceramic insulator provides superior strength and better heat transfer
- RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
- Special insulator nose configurations improve throttle response
- Triple seals prevent leakage
Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.
Specifications
Product Details
| Center Electrode Core Material: | Copper |
| Center Electrode Tip Material: | Iridium |
| Description: | NGK Iridium IX Spark Plug |
| Electrical Terminal Type: | Non-Removable Nut |
| Ground Configuration: | Standard |
| Ground Electrode Core Material: | Nickel |
| Ground Electrode Quantity: | 1 |
| Ground Electrode Tip Design: | Taper Cut |
| Hex Size: | 5/8 |
| Insulator Height: | 55.00 |
| Manufacturer Heat Range: | 4 |
| Part Number: | UR4IX |
| Pre-Gap Size: | .040 |
| Reach: | .46 |
| Resistance: | 5000.0 |
| Seat Type: | Tapered |
| Stock Number: | 7401 |
| Thread Diameter: | 14.00 |
Reference Information
| Reference Data (Provide these details to our support team) | |
|---|---|
| Brand Name/s | Ngk, Ngk Spark Plugs |
| StreetFX SKU | ngk7401 |
| SFX Item ID | 4150129 |
| Accounting SKU | ngk-7401 |
| Manufacturer SKU | 7401 |
| Manufacturer UPC | 87295174012 |
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