The legendary Chevy 350 small block is one of the most iconic engines in automotive history, known for its durability, performance potential, and widespread use in classic cars, trucks, and hot rods. To keep it running strong, you need the right spark plugs. The correct plugs can improve ignition performance, fuel efficiency, throttle response, and even horsepower. In this guide, we’ll review the best spark plugs for the 350 Chevy engine, compare top options, and help you choose the right plugs for your build.
Quick Picks
- Best Overall: ACDelco R45TS Professional Conventional Spark Plug – OEM-style reliability for stock 350 engines.
- Best Budget: NGK V-Power Spark Plug – Affordable, dependable, and great for daily drivers.
- Best Premium: Bosch Platinum+4 Spark Plug – Multi-ground electrode design for performance and longevity.
Buyer’s Guide – How to Choose Spark Plugs for a Chevy 350
Before selecting spark plugs, consider the following factors:
- Engine Setup: A stock 350 works best with copper-core plugs, while high-performance builds may benefit from platinum or iridium.
- Heat Range: Colder plugs are used for high-compression or forced induction engines, while hotter plugs suit daily-driven, lower-stress engines.
- Material:
- Copper: Best conductivity, shorter lifespan, great for older engines.
- Platinum: Longer life, reliable for stock to mild performance builds.
- Iridium: Maximum durability, excellent for high-performance 350s.
- Gap Setting: Most Chevy 350 engines run best with a 0.035” gap, but check your ignition system specs.
- Driving Style: Daily driving, towing, or racing require different plug characteristics.
Detailed Product Reviews
ACDelco R45TS Professional Conventional Spark Plug
Who it’s for: Owners of stock Chevy 350 engines looking for OEM reliability.
- Key Benefits: Copper core for excellent conductivity, designed for GM engines, reliable ignition performance.
- Pros: OEM quality, affordable, trusted by GM enthusiasts.
- Cons: Shorter lifespan compared to platinum or iridium plugs.
Final Verdict: The best stock replacement plug for the 350 Chevy. Check Price Here
NGK V-Power Spark Plug
Who it’s for: Budget-minded drivers who still want great ignition performance.
- Key Benefits: Copper core, V-groove design for better spark exposure, reliable ignition.
- Pros: Low cost, dependable, widely available.
- Cons: Needs replacement more often than iridium/platinum plugs.
Final Verdict: The best budget-friendly spark plug for daily-driven 350 engines. Check Price Here
Bosch Platinum+4 Spark Plug
Who it’s for: Drivers who want longer-lasting spark plugs with strong ignition performance.
- Key Benefits: Four ground electrodes, platinum center electrode, extended service life.
- Pros: Long life, consistent spark, great for mild performance builds.
- Cons: More expensive than copper-core plugs.
Final Verdict: A premium upgrade for long-lasting performance. Check Price Here
Denso Iridium Power Spark Plug
Who it’s for: High-performance 350 Chevy engines with aftermarket upgrades.
- Key Benefits: Ultra-fine iridium tip, superior ignition efficiency, high durability.
- Pros: Excellent for racing or performance builds, long life.
- Cons: Premium price, not necessary for stock builds.
Final Verdict: Best for performance-tuned or racing 350 small blocks. Check Price Here
Champion Copper Plus Spark Plug
Who it’s for: Classic 350 owners looking for traditional spark plug performance.
- Key Benefits: Copper construction, dependable ignition, budget-friendly.
- Pros: OEM-style replacement, affordable, trusted in older engines.
- Cons: Requires more frequent replacement than platinum/iridium plugs.
Final Verdict: A solid choice for vintage or restoration 350 Chevy engines. Check Price Here
Autolite Iridium XP Spark Plug
Who it’s for: Drivers seeking a balance of longevity and performance.
- Key Benefits: Iridium-enhanced fine wire, nickel-plated shell, extended lifespan.
- Pros: Excellent value, great for both daily and performance use.
- Cons: More expensive than copper plugs.
Final Verdict: A versatile choice for both stock and modified 350 Chevy engines. Check Price Here
Comparison Table
| Product | Material | Best For | Lifespan | Price |
|---|---|---|---|---|
| ACDelco R45TS | Copper | Stock 350 engines | 15k–20k miles | Check Price |
| NGK V-Power | Copper | Budget/daily drivers | 20k–30k miles | Check Price |
| Bosch Platinum+4 | Platinum | Performance/durability | 60k+ miles | Check Price |
| Denso Iridium Power | Iridium | High-performance builds | 80k+ miles | Check Price |
| Champion Copper Plus | Copper | Classic/vintage 350s | 15k–25k miles | Check Price |
| Autolite Iridium XP | Iridium | Daily & performance | 80k+ miles | Check Price |
FAQ Section
What spark plug gap is recommended for a Chevy 350?
The standard spark plug gap for most Chevy 350 engines is 0.035 inches, though high-performance ignition systems may require different settings.
Which spark plug material is best for a Chevy 350?
Copper plugs are great for stock engines, platinum is ideal for durability, and iridium is best for high-performance builds.
How often should I change spark plugs in a 350 Chevy?
Copper plugs should be replaced every 15,000–20,000 miles, platinum every 60,000 miles, and iridium every 80,000–100,000 miles.
Can I upgrade to iridium plugs in my classic Chevy 350?
Yes, but unless your ignition system is upgraded, you may not see the full benefit. Stock engines run perfectly fine on copper plugs.
What’s the best spark plug brand for Chevy engines?
ACDelco (OEM), NGK, Bosch, Denso, Champion, and Autolite all make high-quality plugs suitable for different builds and budgets.
Conclusion
The best spark plugs for a 350 Chevy engine depend on your setup and driving style. For stock engines, ACDelco R45TS or NGK V-Power are perfect choices. If you want extended life and durability, go with Bosch Platinum+4 or Autolite Iridium XP. For high-performance builds, Denso Iridium Power offers excellent ignition efficiency. No matter your choice, the right spark plugs will keep your Chevy 350 running strong for years to come. Get your spark plugs today and give your 350 Chevy the spark it deserves.
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