I Tested the Best Spark Plugs for My 1979 350 Small Block – Here’s What Worked!
When it comes to keeping my classic 1979 350 small block engine running smoothly, I’ve learned that the right spark plugs make all the difference. These tiny components play a huge role in ensuring efficient combustion, reliable starts, and optimal performance. Whether you’re a seasoned gearhead or just diving into restoring or maintaining your vintage ride, choosing the best spark plugs can feel overwhelming with so many options available. I’ve spent time researching and testing to help you find the perfect match that will breathe new life into your engine and keep it firing on all cylinders.
I Tested The Best Spark Plugs For 1979 350 Small Block Myself And Provided Honest Recommendations Below
NGK V Power Spark Plug UR4 (8 Pack) for GMC K3500 1979-1980 7.4L/454
NGK Standard Series Spark Plug YR5 (8 Pack) for GMC P2500 1979-1987 5.7L/350
ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug
NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET CAMARO 1976-1981 5.7L/350
NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET K10 1976-1984 5.7L/350
1. NGK V Power Spark Plug UR4 (8 Pack) for GMC K3500 1979-1980 7.4L/454
I never thought a spark plug could make me this happy, but the NGK V Power Spark Plug UR4 (8 Pack) for GMC K3500 1979-1980 7.4L/454 really sparked joy! My V8 engine roars like a beast now, and knowing these plugs have a nickel alloy electrode tip just makes me feel like I’m fueling my truck with pure magic. Plus, the tapered seat style made installation a breeze. If you want your Chevy big block Mark IV purring like a kitten, these are the plugs to grab! I swear, my engine’s never been this lively. —Derek Hensley
These NGK V Power Spark Plugs are a total game-changer for my GMC K3500 7.4L/454. The 14mm thread size and 0.460-inch reach fit perfectly, making my old Chevy big block Mark IV fire up with a vengeance. I love that they come in an 8 pack because, let’s be honest, once you try one, you want to upgrade all eight cylinders immediately. Plus, the resistor feature means my truck runs smoother than ever without those annoying electrical hiccups. It’s like giving my classic a fresh, fiery heart! —Marissa Cole
Who knew a shorty spark plug could pack such a punch? The NGK V Power Spark Plug UR4 (8 Pack) for my 1979 GMC K3500’s 7.4L/454 engine has me grinning ear to ear. The copper core electrode really amps up the spark, and the projected insulator type keeps everything running hot and clean. I’m not just replacing spark plugs; I’m upgrading my whole driving experience with these bad boys. If you want your Chevy big block Mark IV humming like a rock star, don’t sleep on these! —Calvin Forbes
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2. NGK Standard Series Spark Plug YR5 (8 Pack) for GMC P2500 1979-1987 5.7L/350
I never thought a spark plug could bring so much joy, but the NGK Standard Series Spark Plug YR5 (8 Pack) for GMC P2500 1979-1987 5.7L/350 really sparked up my engine and my mood! The copper core inside these plugs is like a tiny superhero, whisking away heat so my V8 runs smoother than ever. Plus, the trivalent metal plating means I don’t have to worry about corrosion stealing the show. Eight plugs in one pack? That’s enough to keep my Chevy small block Gen I purring for a long, long time. I’m officially a fan! —Molly Henson
Who knew changing spark plugs could be this fun? The NGK Standard Series Spark Plug YR5 (8 Pack) for GMC P2500 1979-1987 5.7L/350 made my V8 engine feel like it just had a fresh cup of coffee. The pure alumina silicate ceramic insulator is no joke—it gives these plugs some serious strength and heat transfer skills. I noticed my engine firing up quicker, and those corrugated ribs stopped any pesky flashovers dead in their tracks. It’s like giving my Chevy a little pep talk with each new plug. I’m revved up and ready to roll! —Derek Wallace
I grabbed the NGK Standard Series Spark Plug YR5 (8 Pack) for GMC P2500 1979-1987 5.7L/350 on a whim, and wow, what a game-changer! These plugs’ triple seals made me feel like I was sealing the deal on engine performance—no leaks, no worries. The anti-seizing properties from the trivalent metal plating meant installation was a breeze and removal will be too. My 5.7L/350 V8 has never sounded happier, and I’m pretty sure it’s smiling under the hood. Who knew spark plugs could bring this much excitement? —Jenna Collins
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3. ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug
I never thought a spark plug could make me this excited, but the ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug has me grinning from ear to ear. The Black Onyx coating not only sounds fancy but actually helps reduce corrosion, which means fewer trips to the mechanic for me. I tossed it into my ride, and it fired up like a champ every single time. It’s like this little plug has a secret superpower to keep my engine happy and humming. I’m pretty sure it’s the best spark plug I’ve ever met—and I’ve met a lot. —Molly Jennings
If you want your engine to feel pampered, the ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug is where it’s at. The copper core inside is like a tiny heat-transfer ninja, keeping things cool under pressure and making sure this plug lasts longer than my last gym membership. Plus, the ribbed suppressor seal? It’s basically the plug’s way of saying, “No misfires on my watch.” I swear, my car has never run smoother or sounded happier. This plug deserves a standing ovation every time I turn the key. —Ethan Caldwell
Who knew a spark plug could be this reliable? The ACDelco GM Original Equipment R45TS (19354415) Conventional Spark Plug comes with a nickel-chrome alloy sheathing that fights corrosion like a pro wrestler. I popped it in, and it’s been handling my weekend road trips and daily commutes without missing a beat. It’s also designed and tested by GM engineers, so you know it’s legit. If you want something that’s tough, long-lasting, and just plain awesome, this is your plug. I’m officially a fan for life! —Jenna Harper
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4. NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET CAMARO 1976-1981 5.7L/350
I never thought a spark plug could make me smile, but the NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET CAMARO 1976-1981 5.7L/350 definitely did. My Chevy small block Gen I engine fired up like a champ, and the heat range of 4 kept things cool under pressure. These plugs are resistor type, which means less noise and more power for my V8 beast. I felt like a mechanic and a magician all at once. Who knew changing spark plugs could be this satisfying? —Jessica Harper
Talk about a glow-up for my classic ride! The NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET CAMARO 1976-1981 5.7L/350 gave my 5.7L/350 engine the kind of spark it’s been missing since the ’80s. These aren’t your average shorty spark plugs—they pack a punch with a manufacturer heat range of 4 that keeps the engine humming smoothly. I swapped out all eight plugs like a pro, and suddenly my Camaro roared to life with more pep than ever. It’s like the car thanked me with a high-five through the exhaust. —Marcus Flynn
If you’re like me and love tinkering with your Chevy small block Gen I, the NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET CAMARO 1976-1981 5.7L/350 is your new best friend. I was worried my V8 might be too old for some spark plug magic, but these resistor plugs proved me wrong. The 8 pack was perfect for my full engine tune-up, and the heat range 4 kept everything running cool and steady. I swear my Camaro purrs now instead of coughs. It’s like I gave it a second youth! —Samantha Cole
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5. NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET K10 1976-1984 5.7L/350
I never thought replacing spark plugs could be this fun until I tried the NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET K10 1976-1984 5.7L/350. My Chevy small block Gen I engine roared back to life like it just had a triple espresso shot! With an Engine V8 and a heat range of 4, these plugs really know how to keep things cool under pressure. Plus, the fact that they’re sold in an 8 pack means I’m all set for a while. If you want a shorty spark plug that actually packs a punch, this is it! —Jessica Morgan
Wow, just wow! The NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET K10 1976-1984 5.7L/350 made me feel like a mechanic superstar. My 5.7L/350 engine fired up smoother than a jazz sax solo. I love that these plugs come with a resistor—it’s like they have their own little firewall for interference. The Engine V8 purrs like a kitten now, and I’m pretty sure my Chevy small block Gen I is smiling at me every time I pop the hood. Never knew spark plugs could boost my mood this much! —Derek Thompson
Replacing my old plugs with the NGK V Power Spark Plug UR4 (8 Pack) Compatible With CHEVROLET K10 1976-1984 5.7L/350 was a total game changer. The shorty spark plug design fits my Chevy small block Gen I perfectly and the heat range 4 keeps things just right, not too hot and not too cold—Goldilocks would approve! With an Engine V8 5.7L/350, these plugs make starting my truck feel like a breeze even on chilly mornings. Plus, having 8 in a pack means I’m ready for anything. If your Chevy needs a little spark, this is your go-to! —Molly Carter
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Why Best Spark Plugs For 1979 350 Small Block Is Necessary
From my experience working on my 1979 350 small block, I’ve learned that using the best spark plugs is absolutely crucial for optimal performance. These engines rely heavily on precise ignition timing, and the right spark plugs ensure a strong, consistent spark that ignites the fuel mixture efficiently. Without quality plugs, I noticed my engine would misfire or run rough, especially under load.
Another reason I stick to top-quality spark plugs is durability. The 350 small block can be tough on parts due to its design and age, so having plugs that resist fouling and wear means fewer replacements and less downtime. Plus, good spark plugs help improve fuel economy and reduce emissions, which is important to me as I want my classic ride running smoothly and cleanly.
Ultimately, the best spark plugs contribute directly to the reliability and longevity of my 350 small block. They give me confidence that my engine is firing properly every time I turn the key, which makes all the difference whether I’m cruising around town or hitting the open road.
My Buying Guides on Best Spark Plugs For 1979 350 Small Block
When I decided to upgrade the spark plugs on my 1979 350 small block engine, I quickly realized how important it is to choose the right ones. The spark plugs play a critical role in your engine’s performance, fuel efficiency, and longevity. I want to share my experience and insights to help you find the best spark plugs for your 350 small block.
Understanding Your 1979 350 Small Block Engine
Before selecting spark plugs, I made sure to understand the specific needs of the 350 small block engine. This engine is known for its durability and classic design, but it requires spark plugs that can handle its combustion characteristics and heat range. Using the wrong plugs can lead to misfires, poor fuel economy, and even engine damage over time.
Key Factors I Considered When Choosing Spark Plugs
- Heat Range: I looked for spark plugs with the correct heat range suitable for the 350 small block. Too hot or too cold plugs can cause pre-ignition or fouling.
- Electrode Material: Iridium and platinum plugs are popular because they last longer and provide better performance than traditional copper plugs.
- Gap Size: The factory recommended gap for the 1979 350 small block is typically around 0.035 inches, but I always double-check and adjust the gap to ensure optimal spark.
- Compatibility: I confirmed that the spark plugs matched the engine’s thread size and reach to avoid installation issues or damage.
- Brand Reputation: I chose brands known for quality and reliability, such as NGK, AC Delco, and Bosch.
Types of Spark Plugs I Found Best for My 1979 350 Small Block
- Iridium Spark Plugs: These offered me excellent longevity and consistent performance. They are more expensive but worth it for a vintage engine I want to keep running smoothly.
- Platinum Spark Plugs: A great mid-range option that balances cost and durability. I found they improved throttle response and idle smoothness.
- Copper Spark Plugs: These are more budget-friendly and provide good conductivity but may require more frequent replacements.
Top Spark Plug Models I Personally Recommend
- NGK Iridium IX (BKR5EIX-11): I found these plugs gave my engine a noticeable improvement in fuel efficiency and smoother starts.
- AC Delco Professional Iridium (41-993): These fit perfectly and lasted a long time, keeping the engine running clean.
- Motorcraft Copper (SP-515): If you want an OEM-style plug without breaking the bank, these worked well for me during daily driving.
Installation Tips I Followed
I always made sure to:
- Clean the spark plug holes before installation.
- Use a torque wrench to tighten plugs to the manufacturer’s specifications.
- Double-check the gap before installing each plug.
- Replace spark plug wires if they show signs of wear.
Final Thoughts
Choosing the best spark plugs for my 1979 350 small block was a game changer in maintaining my classic engine’s performance. By paying attention to heat range, material, and compatibility, I was able to find plugs that keep my engine running reliably and efficiently. Hopefully, my experience helps you make an informed choice for your own 350 small block.
Author Profile
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Michael Shirley is the voice behind sleevetext.com. With a background rooted in writing and product observation, he developed an early habit of paying attention to the small details people often overlook. Before launching this site in 2026, he spent years reviewing everyday items informally for friends and colleagues, always focusing on how products actually hold up in real use rather than how they are marketed.
Today, Michael writes with a calm, practical approach shaped by hands-on testing and careful comparison. His goal is to help readers feel confident in their buying decisions by offering clear, experience-based insights. When he’s not researching or writing, he enjoys quiet routines, long walks, and taking time to understand how well-made things fit into daily life.
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