Choosing the Right Spark Plugs for Your 1987 Chevrolet V20
Get the right spark and keep your classic Chevy truck running strong with the correct plugs.
- For a stock 1987 V20, stick with reliable OEM-equivalent brands like ACDelco or NGK for the best results.
- Standard copper plugs are affordable and perform excellently in this engine; just plan to change them every 20-30k miles.
- Check the spark plug gap before installation. A gap of 0.045 inches is a reliable modern standard for your truck's ignition.
- Consider replacing the spark plug wires, distributor cap, and rotor at the same time for a complete and effective tune-up.
Signs of Failing Spark Plugs in Your V20
Worn-out spark plugs can cause a number of noticeable problems in your 1987 V20. Because these trucks use a simple and robust ignition system, they are very sensitive to the condition of the plugs. If you experience any of these symptoms, it might be time for a new set.
- Rough Idling: The engine may shake or vibrate more than usual when the truck is stopped.
- Engine Misfires: You might feel a hesitation or stumble during acceleration because a cylinder isn't firing correctly.
- Reduced Power: The truck may feel sluggish and less responsive, especially when towing or hauling.
- Worse Fuel Economy: Inefficient combustion from bad plugs means you'll be stopping for gas more often.
- Hard Starting: A weak spark can make it difficult for the engine to turn over and start, especially when cold.
Choosing the Right Aftermarket Spark Plugs
For a workhorse truck like the 1987 V20, you don't need the most expensive plugs on the shelf. Reliability and consistency are key. The original 5.7L V8 engine is not complex, and it performs very well with traditional spark plugs. Here’s a breakdown of available brands.
Tier 1: OEM Equivalent & Best Bets
These brands are known to work best with General Motors vehicles of this era. For a stock or lightly modified engine, these are your safest and most reliable choices.
- ACDelco: As the original equipment (OE) supplier for GM, ACDelco plugs are the factory-recommended choice. They are designed specifically for your truck's engine. Many owners and mechanics insist on using ACDelco to ensure smooth operation.
- NGK: A highly respected brand that is known for its quality and performance. In many cases, NGK is the actual manufacturer for ACDelco plugs. You cannot go wrong with NGK V-Power or standard copper plugs for your V20.
Tier 2: Reliable Aftermarket Alternatives
These brands offer a good balance of quality and price. They are a solid choice if ACDelco or NGK are not available.
- Autolite: A popular aftermarket brand that offers good performance. Their standard copper and platinum plugs are a dependable option for the V20.
- Denso: Known for excellent quality, Denso plugs are a strong contender and often used as original equipment in other vehicle brands.
- Bosch: A German brand with a long history of making quality ignition components. Their platinum plugs are a common upgrade.
Tier 3: Performance & Budget Options
These brands serve specific needs, from high-performance builds to budget-friendly repairs.
- MSD: Known for high-performance ignition systems, MSD plugs are geared towards modified engines that require a stronger spark.
- Accel: Often used in performance applications. Accel also makes "shorty" spark plugs that provide extra clearance for aftermarket exhaust headers.
- Champion: A widely available and budget-friendly option. While some mechanics have strong opinions, they are a long-standing brand that meets basic requirements.
Spark Plug Cost Comparison
| Option | Price Range (Set of 8) | Best For |
|---|---|---|
| Standard Copper (ACDelco, NGK) | $28 - $40 | Original performance, reliability |
| Platinum (Autolite, Bosch) | $40 - $75 | Longer life, durability |
| Iridium / Performance (MSD, NGK Iridium) | $75 - $97+ | Modified engines, maximum life |
Pro Tip: Copper vs. Platinum and Iridium
For your 1987 V20, traditional copper spark plugs are often the best choice. The ignition system was designed for them, and they provide excellent performance at a low cost. Platinum and iridium plugs last much longer but may not offer any noticeable performance gain on a stock engine. Stick with quality copper plugs like ACDelco or NGK V-Power and change them more frequently (every 20,000-30,000 miles) for peak performance.
Frequently Asked Questions (FAQ)
What is the correct spark plug gap for a 1987 V20?
While the original emissions sticker may list a gap as wide as 0.060 inches, most mechanics and modern plug manufacturers recommend a gap of 0.045 inches for a 1987 V8 with an HEI ignition. This smaller gap provides a more consistent spark with today's fuel. Always check the gap with a feeler gauge before installation.
How often should I replace the spark plugs?
For standard copper plugs, a good interval is every 20,000 to 30,000 miles to keep the engine running at its best. If you choose to use longer-life platinum or iridium plugs, you can extend that interval to 60,000 miles or more, but they are more expensive upfront.
Should I replace my spark plug wires at the same time?
Yes, it is highly recommended. Spark plug wires degrade over time, and old wires can't deliver the strong electrical pulse your new plugs need. Replacing the wires, distributor cap, and rotor along with the plugs is a complete tune-up that will restore performance and reliability.
Is it hard to change the spark plugs on a 1987 V20?
No, this is a great DIY job for beginners. The engine bay of the V20 offers plenty of room to work compared to modern trucks. The rearmost plugs can be slightly harder to reach, but the job can be done with basic hand tools like a ratchet, extensions, and a spark plug socket.
Technical Specifications
OEM Part Numbers: CR43TS R44LTS6
Engine: 5.7L (350ci) V8 | Recommended Spark Plug Gap: 0.045 inches
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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- Signs of Failing Spark Plugs in Your V20
- Choosing the Right Aftermarket Spark Plugs
- Tier 1: OEM Equivalent & Best Bets
- Tier 2: Reliable Aftermarket Alternatives
- Tier 3: Performance & Budget Options
- Spark Plug Cost Comparison
- Pro Tip: Copper vs. Platinum and Iridium
- Frequently Asked Questions (FAQ)
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