5 Best Spark Plugs for a Chevy 350 to Maintain a High-Performance Engine

There’s no denying that your engine is the most important part of your vehicle, and failure to keep your engine maintained can be both costly and renders your vehicle useless. While you may service your engine, maintain your oil levels and the sorts, paying special
attention to the actual parts of your engine can be highly beneficial.

As a Chevy 350 owner, you’ll want to make sure your engine is running in tip-top condition, so you can live your life problem-free. With this in mind, perhaps one of the most overlooked aspects of your engine is your spark plugs.

By ignoring the condition of your spark plugs, not only can you potentially damage your engine, but you can also seriously affect its performance. While it’s easy to get the most affordable plugins with a ‘that will do mindset,’ taking the time to invest in a high-quality spark plug can bring so many benefits to your life.

Fortunately, we’ve done the hard work for you and searched across the market to pull together the five best spark plugs for your Chevy 350 available today. These are the plugs that will bring you the highest level of functionality, the best firing rates and the longest lifespan per unit; saving you money in the long-term.

We’ve taken everything into consideration that you’ll want to be thinking about, including quality performance and of course price, ultimately helping you make the best purchasing decision. So, without further ado, let’s jump into it!

Autolite AP605 Platinum Spark Plug

Autolite AP605 Platinum Spark Plug

To start off our list, we’ve opted for this fantastic spark plug by Autolite that does everything you need it to for an affordable price; perfect for budget-conscious buyers who don’t want to compromise on quality and performance.

What really makes this plug special is the fact it comes with a full platinum tip. This is designed to make sure there’s no gap when it’s plugged into your Chevy 350 engine, which prevents the risk of erosion. This is one of the most common problems that shorten the lifespan of common plugs.

There’s also a ton of other features that are designed to prevent this problem, such as Yttrium enhanced alloy electrodes and a platinum alloy pad on the ground electrode. Over all this, there’s even a nickel-plated shell for extra corrosion resistance.

However, another awesome feature is the fact that this combination of metals helps the spark plugs to ignite more effectively, more quickly and much cleaner than common plugs. This requires less voltage from your battery, increases acceleration and even betters your fuel economy.

The only real downside we can see to this plug is the fact that they only come in single units and must be brought separately. However, for the price they are, this isn’t really a problem.

  • Highly durable design that’s built to last
  • Premium combination of metals for increased reliability
  • Resistant against rust and corrosion
  • Clean and improves acceleration and fuel efficiency
  • Only comes as a single unit

ACDelco R42LTA Professional Conventional Spark Plug

ACDelco R42LTA Professional Conventional Spark Plug

Another truly affordable spark plug next from ACDelco, a really popular engine part brand around the world, and another brand you can put your trust in. This plug is relatively similar to the one above, but with a few slight differences that make it unique.

For example, this plug is finished with a black onyx coating. This is designed to reduce the risk of general corrosion and rust, which ultimately improves the lifespan of the spark plug. This plug also comes with a nickel-chrome alloy that provides the same benefit.

What really makes this plug stand out is the copper core center. Copper, of course, is a fantastic conductor of heat, which in this case helps to transfer the heat through your spark plug effectively. This boosts performance compared with a tacky spark plug and again increases durability.

The second main feature we love about this plug is the ribbed suppressor seal. While this is a common feature on many ACDelco plugs, it’s pretty much unique to the brand. This handy feature helps to stop the spark flashing over and ultimately misfiring. This improves reliability, even on low-voltages.

With all these features in mind, there’s really nothing bad to say about the plugs. ACDelco has been a trusted spark plug brand for many drivers for years, and there are no reports of this plug being any different to the trend. If you’re looking for an affordable plug that you can trust, you might not need to look further than this!

  • A copper core for efficient heat transfer
  • A worldwide trusted spark plug brand
  • A ribbed suppressor seal to minimize misfires
  • A black onyx coating for extra durability
  • None!

NGK 3403 G-Power Platinum Spark Plug (6-Pack)

NGK 3403 G-Power Platinum Spark Plug (6-Pack)

If you’re looking for more than a single unit spark plug and would rather have a pack, so you can fully upgrade your engine, or simply have the replacements spare to hand when you need them, NGK has a great solution you’re going to love.

With this purchase, you’ll have access to six individual units, and since you’re not paying for a single unit in packaging, the price of each set is highly competitive. Like other premium quality spark plugs, this one is built with high-quality platinum materials.

This means you’ll be able to enjoy optimal heat transfer and faster, more reliable ignitions, even when you have a low-voltage in your vehicle. This is again complimented by the fine wire center which optimizes this process even more.

What’s more, this design helps to enhance your acceleration times and even improves fuel efficiency, once again saving you money in the long-term. Each plug has also been wrapped with a protective metal coating that helps the plug to last longer while minimizing the risk of corrosion and everyday wear and tear.

It’s even been triple-sealed to protect it from leakages! All in all, this is a really excellent product, and you can tell the attention to detail that has been put into making it. It’s built to perform, get the job done, and guarantees to stand the test of time!

  • Triple-sealed build to protect against leakages
  • Fine-wire center and platinum tip for maximum performance
  • Improves fuel efficiency of your engine
  • Speeds up acceleration times
  • None!

ACDelco 41-110 Professional Iridium Spark Plug

ACDelco 41-110 Professional Iridium Spark Plug

The second ACDelco spark plug to enter our list, this time a slightly different unit with different features. What’s more, this set comes as a pack of eight, allowing you to fully replace the spark plugs in your engine, or have some lying around for spares.

What sets these spark plugs apart from the rest is the fact that it’s been crafted using iridium metals. This is renowned for being one of the hardest wearing metals in the automobile industry, as well as performing to the highest capabilities.

In short, these plugs are designed to last at least 100,000 miles, and still provides all the benefits of improved acceleration and fuel efficiency. As you would expect from a leading plug, the unit itself has been protected to decrease corrosion and general wear and tear.

From the reports we’ve read, it seems that during the entire lifespan of this product, the spark gap itself barely changes, ensuring you’ll be able to enjoy the full level of performance right up until the day you need to replace it.

Again, ACDelco has outperformed themselves with this negative-free unit. While you’ll need to check beforehand to make sure the plugs fit (which you can do by contacting the friendly customer service team), if it does fit, you’ve got yourself a perfect spark plug.

  • Designed to last up to 100,000 miles
  • Protected against rust, corrosion and engine vibrations
  • The spark gap barely moves during the lifespan of the plug
  • Improves fuel efficiency and engine reliability
  • May not fit some engine models (check before purchase)

ACCEL 0526-4 Copper Core Spark Plug

ACCEL 0526-4 Copper Core Spark Plug (4-Pack)

To conclude our list of the best spark plugs, we’ve chosen this awesome pack of four set from Accel that have quite frankly gone above and beyond the call of duty when it comes to creating a high-performance spark plug.

For example, thanks to the innovative copper core, the sparks produced are far hotter than your conventional counterpart, thus creating a more efficient burn in your engine. Not only does this bring about all the benefits we’ve spoken about above, but it also gives you more power at high RPM speeds.

From the moment you install these plugs, you’ll instantly notice the improvement in the response of your throttle, and over time you’ll see the improvements in your fuel economy. In terms of quality, each unit has been machine rolled with a 14mm thread.

This gives the plug added protection and durability which is designed to protect your cylinder heads, ultimately protecting your engine. Again, these plugs have nothing wrong with them, just make sure you check they fit before you buy!

  • Performs exceedingly well at high RPM levels
  • Improves acceleration
  • Machine-rolled 14mm thread to protect your cylinder heads
  • Improves fuel economy in the long-term
  • None!


While it’s easy to overlook the spark plugs you’re using, when you’re mindful of them, there’s no reason why you can’t treat yourself to the best. Every one of the five plugs we’ve listed above make an outstanding choice for your Chevy 350 engine, so feel free to take your pick!