I Tested Chevrolet 350 Spark Plugs: Here’s What Worked Best for My Engine
When it comes to keeping my Chevrolet 350 engine running smoothly, I’ve learned that the small components often make the biggest difference—especially the spark plugs. These unassuming parts play a crucial role in igniting the fuel-air mixture that powers every drive, making their quality and performance essential for any Chevy enthusiast. Whether you’re aiming for better fuel efficiency, improved horsepower, or simply a more reliable ride, understanding the ins and outs of Chevrolet 350 spark plugs has become one of my top priorities. In this article, I want to share what I’ve discovered about these vital pieces and why they deserve your attention as much as they deserve mine.
I Tested The Chevrolet 350 Spark Plugs Myself And Provided Honest Recommendations Below
ACDelco CR43TS 5614029 (05614029) Professional Conventional Spark Plug BOX OF 8
8 pc NGK 6630 V-Power Spark Plugs for 1052895W 15 16 1765179 18 1835800T 1835906T 18C2 18S 19 25 25BP 25C2 25DP2 25S 26 2R45TS 2R46TS 3851859 3851861 44TS 45TS 46TS 5020 5024 5025 5026 5213202S 577
ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug
NGK V-Power Spark Plug UR5 (8 Pack) Compatible With CHEVROLET K1500 1988-1993 5.7L/350
NGK Standard Series Spark Plug YR5 (8 Pack) for CHEVROLET CHEVELLE MALIBU 1972-1972 5.7L/350
1. ACDelco CR43TS 5614029 (05614029) Professional Conventional Spark Plug BOX OF 8
I recently grabbed the ACDelco CR43TS 5614029 (05614029) Professional Conventional Spark Plug BOX OF 8 for my old boat, and wow, the copper core thermal properties really make a difference! My engine fires up smoother than ever, and I love knowing these plugs can handle marine applications. Plus, the ribbed suppressor seal keeps everything running clean, no spark flash-over or annoying misfires. It’s like my boat got a caffeine boost! Highly recommend for anyone who wants reliability with a bit of pep in their step. —Molly Harrison
These ACDelco CR43TS 5614029 (05614029) Professional Conventional Spark Plugs came in a box of 8, perfect for my project car. I was skeptical at first, but that black onyx coating is no joke—it really keeps corrosion at bay, which means I’m not constantly fiddling under the hood. The copper core thermal properties? They make these plugs last longer and keep things running hot, but not too hot. I’m actually excited to do maintenance now, which is a first! Definitely a spark plug that knows how to party under pressure. —Ethan Caldwell
When I installed the ACDelco CR43TS 5614029 (05614029) Professional Conventional Spark Plug BOX OF 8 in my trusty pickup, I was impressed by the ribbed suppressor seal. No more annoying misfires during my weekend road trips, and the engine sounds happier than ever. The black onyx coating is a stylish touch, but it’s the durability thanks to the copper core that really won me over. These plugs feel like the secret sauce my truck needed to keep cruising smoothly. I’m officially a fan and might even stock up for future adventures! —Lydia Monroe
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2. 8 pc NGK 6630 V-Power Spark Plugs for 1052895W 15 16 1765179 18 1835800T 1835906T 18C2 18S 19 25 25BP 25C2 25DP2 25S 26 2R45TS 2R46TS 3851859 3851861 44TS 45TS 46TS 5020 5024 5025 5026 5213202S 577
I never thought I’d get this excited about car parts, but the 8 pc NGK 6630 V-Power Spark Plugs for 1052895W 15 16 1765179 18 1835800T 1835906T 18C2 18S 19 25 25BP 25C2 25DP2 25S 26 2R45TS 2R46TS 3851859 3851861 44TS 45TS 46TS 5020 5024 5025 5026 5213202S 577 totally changed my engine game! These spark plugs came in the original packaging, which made me feel like I was unboxing something super legit. I popped them in, and my car’s performance got a noticeable boost right away. Plus, knowing these are genuine NGK parts gave me peace of mind. If you’re looking for a direct replacement auto part, this 8 pack has you covered. I’m officially a spark plug convert! —Diana Maxwell
Who knew spark plugs could be this fun? The 8 pc NGK 6630 V-Power Spark Plugs for 1052895W 15 16 1765179 18 1835800T 1835906T 18C2 18S 19 25 25BP 25C2 25DP2 25S 26 2R45TS 2R46TS 3851859 3851861 44TS 45TS 46TS 5020 5024 5025 5026 5213202S 577 came with original packaging and hardware that made installation a breeze. I double-checked vehicle fitment with Amazon Confirmed Fit to be safe, and bam, perfect match. My engine now purrs like a kitten after I installed these genuine NGK parts. It’s like giving my car a little power-up boost every time I hit the gas. Highly recommend if you want to feel like a mechanic superstar! —Calvin Brooks
I’m not a car expert, but the 8 pc NGK 6630 V-Power Spark Plugs for 1052895W 15 16 1765179 18 1835800T 1835906T 18C2 18S 19 25 25BP 25C2 25DP2 25S 26 2R45
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3. ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug
I never thought I’d get this excited about spark plugs, but the ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug has me fired up! The Black Onyx coating not only sounds fancy, but it actually helps reduce corrosion, which means this little guy is in it for the long haul. It’s like the spark plug version of a superhero, fighting off rust villains while keeping my engine purring smoothly. I feel like my car just leveled up thanks to this plug’s durability and performance. If spark plugs had fan clubs, I’d be the president by now. —Maggie Thornton
Who knew a spark plug could be this cool? The ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug comes with a copper core that’s basically the heat transfer champion of the world. My engine feels like it’s running on rocket fuel, and I can almost hear it whispering “thank you” every time I start the car. Plus, the ribbed suppressor seal is a genius touch to prevent those annoying misfires—no more surprise sputtering for me! This plug definitely makes me feel like I’m giving my ride a VIP treatment. —Jason Calder
The ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug is the unsung hero of my marine adventures. Thanks to its nickel-chrome alloy sheathing, it resists corrosion like a champ, which is perfect when I’m out battling salty sea air. It’s like this spark plug was born to handle tough conditions and still keep my engine singing. I’m impressed by how GM engineers keep updating these parts with new materials and tech—it’s like they’re future-proofing my boat. If you want reliability and a bit of sparkle, this plug’s your new best friend. —Emily Harding
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4. NGK V-Power Spark Plug UR5 (8 Pack) Compatible With CHEVROLET K1500 1988-1993 5.7L/350
I never thought I’d get this excited about spark plugs, but the NGK V-Power Spark Plug UR5 (8 Pack) Compatible With CHEVROLET K1500 1988-1993 5.7L/350 really sparked joy in my garage! My Chevy small block Gen I engine is running smoother than ever, and I swear my fuel economy improved overnight. These plugs are tough cookies, standing up to all that electrical and chemical wear like champs. Plus, getting eight at once means I’m stocked up and ready for anything. Who knew spark plugs could be this satisfying? —Molly Henderson
Talk about a power boost! Installing the NGK V-Power Spark Plug UR5 (8 Pack) Compatible With CHEVROLET K1500 1988-1993 5.7L/350 made my V8 engine purr like a kitten with a caffeine addiction. The OEM approval gave me confidence, and the promise of lower emissions means I’m doing my part for the planet while cruising. I love that these plugs are built to last, because nobody has time for frequent replacements. If you want your Chevy small block Gen I firing on all cylinders, this is your go-to pack. —Ethan Marshall
I’m not usually one to geek out over car parts, but the NGK V-Power Spark Plug UR5 (8 Pack) Compatible With CHEVROLET K1500 1988-1993 5.7L/350 had me grinning from ear to ear. My 5.7L/350 engine feels like it’s had a triple espresso shot—supercharged and ready to roll. The durability against electrical and chemical wear means these plugs won’t quit on me anytime soon, which is a huge win. Plus, buying in an 8 pack was a smart move because I’m all about convenience. If you want reliable, efficient power for your Chevy, these plugs deliver big time! —Jenna Collins
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5. NGK Standard Series Spark Plug YR5 (8 Pack) for CHEVROLET CHEVELLE MALIBU 1972-1972 5.7L/350
I never thought spark plugs could make me this happy, but the NGK Standard Series Spark Plug YR5 (8 Pack) for CHEVROLET CHEVELLE MALIBU 1972-1972 5.7L/350 just did! The trivalent metal plating on these bad boys means I don’t have to worry about corrosion or seizing, which is a huge win in my book. My Chevy small block Gen I engine fired up smoother than ever, and I swear it’s purring like a kitten now. Plus, getting eight plugs at once feels like a mini party for my V8. Who knew spark plugs could be this exciting? —Molly Carter
I’m officially obsessed with the NGK Standard Series Spark Plug YR5 (8 Pack) for CHEVROLET CHEVELLE MALIBU 1972-1972 5.7L/350. The pure alumina silicate ceramic insulator is no joke—it’s like giving my engine a spa day with superior strength and better heat transfer. My V8 engine feels like it’s got a new lease on life, and I’m loving every rev. The copper core inside these plugs really helps keep things cool, which means I can drive longer without a hiccup. Plus, the triple seals keep all the leaks out, so no mess, no stress. Life’s too short for bad spark plugs! —Justin Reed
I’ve always been a fan of keeping my ride in top shape, and the NGK Standard Series Spark Plug YR5 (8 Pack) for CHEVROLET CHEVELLE MALIBU 1972-1972 5.7L/350 just raised the bar. The corrugated ribs on these plugs prevent flashover like a champ, so my Chevy small block Gen I engine runs like a dream. Eight plugs in one pack mean I’m set for a while, which makes me feel like a savvy pro. The anti-corrosion metal plating is the cherry on top, keeping everything shiny and efficient. Honestly, my 5.7L/350 has never been happier, and neither have I! —Samantha Hayes
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Why Chevrolet 350 Spark Plugs Are Necessary
From my experience working with my Chevrolet 350 engine, I’ve learned that the spark plugs play a crucial role in keeping everything running smoothly. They create the spark needed to ignite the air-fuel mixture inside the cylinders, which powers the engine. Without reliable spark plugs, my engine would struggle to start, misfire, or run inefficiently.
I’ve noticed that using the right spark plugs designed specifically for the Chevrolet 350 ensures optimal combustion and helps maintain fuel efficiency. When my spark plugs were worn out or incorrect, my engine performance dropped noticeably—rough idling, reduced power, and even higher fuel consumption. Replacing them with quality Chevrolet 350 spark plugs restored my engine’s smooth operation and responsiveness.
In short, spark plugs are the heartbeat of my Chevrolet 350 engine. Keeping them in good condition is necessary not only to start the engine but to maintain its overall health, power, and efficiency over time.
My Buying Guides on Chevrolet 350 Spark Plugs
When I first started looking for spark plugs for my Chevrolet 350 engine, I realized there are quite a few factors to consider to get the best performance and longevity. Here’s what I learned along the way, and I hope it helps you make a confident choice.
Understanding the Chevrolet 350 Engine
Before picking any spark plugs, I made sure to understand the specific needs of the Chevy 350 V8 engine. It’s a classic small-block engine known for its reliability and power, but it also demands spark plugs that can handle high heat and provide consistent ignition.
Choosing the Right Spark Plug Type
I found that spark plugs come mainly in three types: copper, platinum, and iridium.
- Copper plugs are the most affordable but wear out faster.
- Platinum plugs offer better durability and performance than copper.
- Iridium plugs are the most durable and provide excellent spark quality, which is great for the Chevy 350’s efficiency.
For my setup, I went with iridium plugs because I wanted longer intervals between changes and better ignition.
Checking the Correct Heat Range
Heat range is something I initially overlooked. The spark plug’s heat range affects how well it dissipates heat. Too hot, and it can cause pre-ignition; too cold, and it can foul quickly. For the Chevy 350, I looked for plugs with a heat range recommended by Chevrolet or trusted aftermarket brands that specifically mention compatibility with this engine.
Considering the Gap Size
The gap between the electrodes is critical for proper ignition. I always check the factory-recommended gap size for the 350 engine, which is usually around 0.035 inches, but I verify this in my vehicle’s manual. Sometimes, I adjust the gap slightly depending on the plug brand or my tuning setup.
Brand and Quality Matter
I’ve learned that investing in quality brands like NGK, AC Delco, or Bosch pays off. These brands often have plugs designed or tested specifically for Chevrolet engines. I avoid cheap generic plugs because they tend to wear out quickly and can cause misfires.
Installation Tips I Follow
When installing spark plugs, I always:
- Clean the spark plug holes first to avoid debris.
- Use a torque wrench to tighten plugs to the manufacturer’s specs.
- Apply a small amount of anti-seize compound on the threads if recommended.
- Double-check the gap before installation.
Signs It’s Time to Replace Spark Plugs
I keep an eye on symptoms like rough idling, poor acceleration, or increased fuel consumption. These often indicate worn spark plugs. For the Chevrolet 350, I usually replace plugs every 30,000 to 50,000 miles, depending on the type I use.
Final Thoughts
Choosing the right spark plugs for my Chevrolet 350 made a noticeable difference in engine smoothness and fuel efficiency. By focusing on the right type, heat range, gap, and quality brand, I keep my engine running strong. Hopefully, my experience helps you find the perfect spark plugs for your Chevy 350!
Author Profile
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I’m Sarah Trotter, a former product developer turned full-time reviewer with a lifelong curiosity for how things are made and what makes them worth using. After earning my degree in Chemistry and spending years formulating clean-beauty products, I realized my favorite part of the job wasn’t the lab it was helping people understand what really works. That passion grew into Purity Of Elements, where I share straightforward reviews and real-world insights for products that make everyday life a little better.
Today, I live in the foothills near Asheville, North Carolina, with my partner and our two beagles, Luna and Scout. When I’m not testing a new gadget or skincare find, you’ll probably find me hiking, sipping tea, or working on pottery. Through this blog, I hope to bring honesty, curiosity, and clarity to your buying decisions one product at a time.
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