--- product_id: 263665189 title: "3951 Pack of 8 Spark Plugs (TR55) | Replaces SP400 SP446 41-600 41-601 41-606 SP-413 241-606 5613869 5614283 5614284 AGSF22N AGSF23C AGSF32N R42LTS6 R43LTS6." brand: "ngk" price: "$72.17" currency: USD in_stock: true reviews_count: 5 category: "Ngk" url: https://www.desertcart.us/products/263665189-3951-pack-of-8-spark-plugs-tr55-replaces-sp400-sp446 store_origin: US region: United States of America --- # High-performance ignition Precision 14mm thread size OEM-grade durability 3951 Pack of 8 Spark Plugs (TR55) | Replaces SP400 SP446 41-600 41-601 41-606 SP-413 241-606 5613869 5614283 5614284 AGSF22N AGSF23C AGSF32N R42LTS6 R43LTS6. **Brand:** ngk **Price:** $72.17 **Availability:** ✅ In Stock ## Summary > ⚡ Ignite your ride with NGK – where power meets precision! ## Quick Answers - **What is this?** 3951 Pack of 8 Spark Plugs (TR55) | Replaces SP400 SP446 41-600 41-601 41-606 SP-413 241-606 5613869 5614283 5614284 AGSF22N AGSF23C AGSF32N R42LTS6 R43LTS6. by ngk - **How much does it cost?** $72.17 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/263665189-3951-pack-of-8-spark-plugs-tr55-replaces-sp400-sp446) ## Best For - ngk enthusiasts ## Why This Product - Trusted ngk brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Bulk Pack Advantage:** Set of 8 plugs to keep your engine firing strong without frequent replacements - • **Unmatched OEM Quality:** Trusted by top manufacturers for flawless fit and function - • **Performance That Lasts:** Copper core and nickel top ensure consistent spark and longevity - • **Top-Ranked Reliability:** Rated #4 in Automotive Performance Spark Plugs with 4.6 stars from 4,800+ users - • **Perfect Fit, Every Time:** Vehicle-specific design for seamless installation—no guesswork ## Overview NGK 3951 TR55 spark plugs deliver OEM-level quality and reliability with a copper core and nickel top, designed for vehicle-specific fitment. This pack of 8 ensures long-lasting performance and easy installation, making it a top choice for cars and trucks seeking enhanced ignition efficiency. ## Description Often specified as original equipment, NGK spark plugs are the best combination of performance and longevity. NGK offers the Quality, Reliability and Durability you'd expect from an OEM manufacturer. NGK is the world's largest supplier of OEM spark plugs. It is recommended to research applications on NGK s website prior to purchase to make sure this OEM part fits your vehicle, including engine, drivetrain and quantity needed. Review: Amazing quality - Amazing quality and fitted my ford mustang gt 4.6 v8 perfectly. Plug and play Review: Would buy this product again - Happy with this product. Fit the truck as advertised . Working well. ## Features - Often specified as original equipment, NGK spark plugs are the best combination of performance and longevity. - Offering the Quality, Reliability and Durability You'd Expect from an OEM Manufacturer - NGK is the world's largest supplier of OEM spark plugs - Research Applications Prior to Purchase To Make Sure This OEM Part Fits Your Vehicle, Including Engine, Drivetrain and Quantity Needed. - This Listing is for 8 3951 TR55 Spark Plugs ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0724YYQG7 | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #2,329 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Performance Spark Plugs | | Brand | NGK | | Brand Name | NGK | | Compatible with Vehicle Type | Car, Truck | | Core Material | Copper | | Core material | Copper | | Customer Reviews | 4.6 out of 5 stars 4,835 Reviews | | Included Components | 3951 | | Item Weight | 0.01 Ounces | | Manufacturer | NGK | | Manufacturer Part Number | TR55 | | Model Number | 3951 | | Number of Items | 8 | | OEM Equivalent Part Number | TR55 | | Thread Size | 14mm | | Thread size | 14mm | | Top Material Type | Nickel | | Top material type | Nickel | | UPC | 087295039519 | | Unit Count | 8 Count | | Vehicle service type | Car, Truck | ## Product Details - **Brand:** NGK - **Core material:** Copper - **Thread size:** 14mm - **Top material type:** Nickel - **Vehicle service type:** Motorcycle ## Images ![3951 Pack of 8 Spark Plugs (TR55) | Replaces SP400 SP446 41-600 41-601 41-606 SP-413 241-606 5613869 5614283 5614284 AGSF22N AGSF23C AGSF32N R42LTS6 R43LTS6. - Image 1](https://m.media-amazon.com/images/I/612lGIMwlCL.jpg) ## Questions & Answers **Q: Will fit 2004 gmc yukon Denali xl** A: Check with seller. They fit in a 1998 ford f150 4.6. **Q: Le quedan a una Tahoe 2001** A: NGK has multiple grades of plugs that may fit your vehicle. It is recommended to go to NGK site at https://ngksparkplugs.com/en/part-finder to verify the applications that will fit your vehicle. This site will show you all of the available plugs to fit your vehicle and will also show you which grade plug is recommended for the best performance of your specific engine. **Q: Will this fit a 1975 chevy c10 pickup 350 v8 4 barrel ?** A: Yes it will if it got to pop-ups Pistons it won't because the Pistons will close it off depending on your heads you know cuz we could be your head could be Empire from the cylinder or not if it's down into the cylinder your Pistons can cram it shut in a break as what get pop-ups do I don't know what kind of horsepower you pushing but yes your answer is it will fit yes it will fit **Q: Will these fit in a 1994 f150 302/5.0?** A: Will they fit and will they work are 2 different questions. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Amazing quality *by A***Y on 7 May 2026* Amazing quality and fitted my ford mustang gt 4.6 v8 perfectly. Plug and play ### ⭐⭐⭐⭐⭐ Would buy this product again *by R***N on 9 July 2026* Happy with this product. Fit the truck as advertised . Working well. ### ⭐⭐⭐⭐⭐ NGK 3951 Motorcycle Copper Spark Plugs (TR55): Superior Performance and Reliability! *by T***B on 15 June 2024* I am thoroughly impressed with the NGK 3951 Pack of 8 Motorcycle Copper Spark Plugs (TR55) for several compelling reasons. Firstly, NGK's reputation for quality precedes them, and these spark plugs live up to the brand's renowned standards. The copper core design ensures excellent conductivity and heat dissipation, which is crucial for maintaining optimal engine performance and longevity. Secondly, installation was a breeze. The plugs fit perfectly into my motorcycle's engine without any issues, thanks to NGK's precise manufacturing and adherence to OE specifications. This made the replacement process straightforward and hassle-free. Thirdly, performance-wise, these spark plugs have significantly improved my motorcycle's engine responsiveness and fuel efficiency. Whether I'm cruising on the highway or tackling challenging terrains, I've noticed smoother acceleration and consistent power delivery throughout the RPM range. Moreover, durability is another standout feature of these spark plugs. They have demonstrated exceptional longevity, holding up well under various riding conditions and environmental factors. This reliability gives me peace of mind knowing that my bike's ignition system is in top-notch condition. Lastly, the value for money is undeniable. With the NGK 3951 Pack of 8, I received a cost-effective solution that not only enhances performance but also offers long-term reliability and durability. In conclusion, if you're looking to optimize your motorcycle's engine performance with a set of spark plugs that deliver on all fronts—quality, performance, reliability, and value—look no further than the NGK 3951 Motorcycle Copper Spark Plugs (TR55). They have earned my highest recommendation without hesitation. Five stars! ## Frequently Bought Together - NGK 3951 Spark Plugs TR55 (8 Pack) - ENA Set of 8 Curved Boot Ignition Coil Pack Compatible with Ford Lincoln Mercury 4.6L 5.4L V8 Replacement for DG508 C1454 C1417 FD503 1L2U12029AA I2LU-12A388-AA C1417 DG473 DG481 DG491 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/263665189-3951-pack-of-8-spark-plugs-tr55-replaces-sp400-sp446](https://www.desertcart.us/products/263665189-3951-pack-of-8-spark-plugs-tr55-replaces-sp400-sp446) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-23*