The 4 Best Spark Plugs for Chevy 350 – Reviews 2024

best spark plugs for chevy 350, chevy 350 spark plugs

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A lot of people don’t put much thought into their spark plugs, instead opting to just get going with whatever is the cheapest. This, however, might not be the best idea. If you’ve got a modern Chevy 350, then you’re in luck. We’ve dug up some of the best performance spark plugs around to help you achieve a better firing rate and the best cold starts around.

Whatever your needs and whatever you’ve done to your motor, an upgrade in spark plugs can make a big difference at the end of the day. We’ll show you some of the best spark plugs for Chevy 350 engines, then help you figure out which ones are ideal for your use.

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

While not taking advantage of some of the newer materials, these copper cored spark plugs are a bit hotter than the standard plugs. This means better response with the throttle and improved fuel efficiency, making them a welcome upgrade over the ones that came with your vehicle.

These eschew some of the advantages of more expensive plugs while still taking advantages of advancing technology. While they’re not ideal for all vehicles, if you have an older vehicle you may want to take advantage of the lower price and sacrifice a bit of performance.

NGK 3403 NGK G-Power Platinum Spark Plug TR55GP – 6 PCS

NGK plugs are some of the best around, and the platinum electrodes on these are fantastic. They’re a step up from copper plugs in pretty much every way, and they’ve become a fast favorite among those in the know.

With these plugs (see full specs) you can smooth out your idle and make sure that you get the most bang for your buck. There are better plugs out there, but they’re going to cost quite a bit more and these are a substantial upgrade over the originals in your vehicle. Hands down, these are among the best spark plugs for Chevy 350 engines.

Autolite APP605 Double Platinum Spark Plug

Double platinum spark plugs use a platinum compound on both ends of the electrode, allowing for even better performance although they cost significantly more than the others. These plugs from Autolite are still affordable for most and offer a big improvement in fuel efficiency and power over lesser plugs.

Going with these is a great idea if you’ve started making modifications to your engine, or plan on doing so soon. Higher performance will require a more powerful spark plug, and these will fit the bill for most people.

NGK (7397-4PK) TR5IX Iridium IX Spark Plug, (Box of 4)

When it comes to getting the most out of your spark plugs, iridium makes for the best alloy currently on the market. These are top of the line plugs and most people won’t receive any benefit from them over a double platinum plug but if you’ve had some serious performance enhancements then there’s no better choice.

On top of this, these are treated for an amazing amount of corrosion resistance. If you need long lasting, performance enhancements and you’re willing to pay for it, then the NGK TR5IX (see full specs) makes the best solution possible.

Picking Out the Best Spark Plugs for Chevy 350 Engines

When it comes to picking out the right spark plugs for your motor, you’ll need to apply a little bit of thought on what all you’ve done to the engine thus far. Higher performance means you’ll need higher end plugs in order to maintain smooth operation.

For the most part, unless you’re getting into highly specialized racing modifications, we recommend you go with double platinum plugs. While they don’t perform quite as well as iridium ones, the price difference is considerable and pretty much everyone will see a benefit from them.

Better plugs will get you quite a bit if you upgrade then you can expect the following:

  • Better starting in the cold
  • Better acceleration
  • Improved fuel economy
  • Longer lifespan of the plugs

That’s a pretty good profile for something which pretty much anyone can easily change out in their front yard for a relatively low cost.

You’ll want to replace all of them at once, so make sure that you get one for all eight cylinders of your motor. Replacing them unevenly is a huge mistake and can result in some strange happenings with the performance of your motor.


The electrode material is probably the most important consideration for the average person.

Copper electrodes are cheap, but many modern engines aren’t going to be too happy with them since platinum is the standard. If your motor is a bit older, however, and you’re happy with the way it runs then purchasing them can be a great cost-cutting measure to just keep your vehicle on the road.

Platinum electrodes are the most common type currently in use. They’re significantly improved over the old copper electrodes and even an older motor will benefit from them. They’re still within a modest price range and they’re a good idea for most people.

Double platinum electrodes utilize platinum on both ends of the electrode. This makes for a cleaner, hotter spark with the same gap and requires less energy in order to fire the cylinder. If you’re looking for an upgrade and haven’t modified the powertrain of your 350 much they’re a great way to get a little bit of extra performance.

Iridium electrodes are the hottest, newest technology on the market. They’re a vast improvement over any other material currently in use. The thing is, double platinum is much more affordable for most people and the improvements over them will only really be noticeable in an engine which has been upgraded quite a bit.

They will last longer than any other type, so it’s not a loss, but don’t expect there to be a world of difference between double platinum and iridium in performance for a stock motor.

Whatever your needs, finding the best spark plugs for Chevy 350 engines is a great way to make some performance improvements without having to spend a whole lot of money. The best part is that you can do it yourself in an hour or so. Take the plunge, and open up a whole new world of performance for your motor.

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  • Founder of Mechanical Caveman, Beau is an unrepentant tool enthusiast and, sporting deadlift-callused hands and an incongruous beer belly, all-around macho guy. When he doesn’t know re tools, he consults with his handyman and car-repairman buds to give you well-reasoned and cutting-edge info.

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