Choosing the Right Spark Plugs for Your 1987 Chevrolet R10
Get the best performance and reliability from your classic truck by selecting the correct spark plugs for your engine.
- For most 1987 R10s, standard ACDelco copper spark plugs are the recommended choice for reliability and performance.
- Avoid gimmick plugs and be cautious with platinum plugs, as they can sometimes cause running issues in these older ignition systems.
- Always check and set the spark plug gap to 0.035 inches before installation.
- Replacing spark plugs is a simple DIY job that can be done in about an hour with basic tools.
Signs of Failing Spark Plugs
When your R10's spark plugs are nearing the end of their life, your truck will give you several clues. Pay attention to these symptoms, as they often mean it's time for a replacement.
- Rough Idling: The engine may shake or vibrate more than usual when stopped.
- Engine Misfires: You might feel a hesitation or stumble from the engine, especially during acceleration.
- Reduced Fuel Economy: If you're filling up the gas tank more often, worn plugs could be the cause.
- Difficulty Starting: A weak spark makes it harder for the engine to turn over and start.
- Poor Acceleration: The truck may feel sluggish or less responsive when you press the gas pedal.
Choosing the Right Aftermarket Spark Plug
For the 1987 R10, which often has a 4.3L V6, 5.0L V8, or 5.7L V8 engine with Throttle Body Injection (TBI), sticking with a standard copper core plug is often the best choice. These engines were designed for them. While modern iridium or platinum plugs last longer, they don't always provide a noticeable performance benefit in this specific ignition system 🎬 See this walkthrough for tuning up a Chevy 350 TBI. and can sometimes cause running issues.
Brand Tiers for Your R10
| Tier | Brands | Description |
|---|---|---|
| OEM / OE-Equivalent | ACDelco, NGK | ACDelco is the original equipment manufacturer for GM vehicles. Many owners and mechanics strongly recommend sticking with standard ACDelco copper plugs like the R45TS for reliable, stock performance. NGK is another high-quality option that works well in these engines. |
| Quality Aftermarket | Autolite, Denso, Champion | These brands offer reliable copper and platinum plugs that are a good alternative to OEM. Autolite and Champion are long-standing brands with options that fit the R10 perfectly. Denso also provides quality replacement plugs. |
| Performance / Specialty | Accel, MSD, Bosch | Brands like Accel and MSD are geared towards modified or high-performance engines. Accel offers "shorty" plugs that can provide more clearance if you have aftermarket headers. Some owners report that TBI engines can be sensitive to certain platinum plugs, including some from Bosch, so it's often best to stick with copper unless you have a specific need. |
Check Your Spark Plug Gap
Always check the spark plug gap before installation, even if the box says they are "pre-gapped." The factory recommended gap for most 1987 R10 gasoline engines is 0.035 inches. An incorrect gap can cause misfires and poor performance. Use a gapping tool to ensure the measurement is precise.
Known Issues, Recalls, or TSBs
There are no specific recalls or Technical Service Bulletins (TSBs) from the NHTSA related to spark plugs for the 1987 Chevrolet R10. Issues with spark plugs on this truck are almost always due to normal wear and tear, improper installation, or using the wrong type of plug for the engine. Some owners have noted that using platinum plugs in the TBI engines can sometimes lead to rough running or misfires.
Pro Tip: One at a Time
To avoid mixing up the spark plug wires, which could cause the engine to run poorly or not at all, replace one spark plug at a time. Remove one wire, replace the plug, and then securely re-attach the wire before moving to the next cylinder.
🎬 Watch: Basic maintenance and spark plug tips for square bodies.Frequently Asked Questions
What is the best spark plug for my 1987 Chevy R10?
For a stock 1987 R10, the overwhelming consensus from owners is to use the standard ACDelco copper resistor spark plugs (like the R45TS or CR43TS). They are inexpensive, reliable, and what the engine was designed for.
Should I use platinum or iridium plugs in my old truck?
While platinum and iridium plugs offer a longer service life, they are not always the best choice for the ignition system in a 1987 R10. Many owners find that standard copper plugs provide the best performance and reliability. Some have experienced issues with platinum plugs.
How often should I change the spark plugs?
For standard copper spark plugs in a 1987 R10, a good interval is every 15,000 to 30,000 miles, or as recommended in your owner's manual. Regular changes will keep your engine running smoothly.
🎬 Watch: Complete tune-up guide for your 1987 Chevy truck.Do I need to put anti-seize on the new spark plugs?
It depends on the plug. Some modern plugs with nickel-plated threads (like many from NGK and Bosch) do not require anti-seize. Applying it can cause you to over-torque the plug. If using a standard plug without this coating, a small amount on the threads can prevent them from getting stuck in the cylinder head.
Helpful Videos
Technical Specifications
OEM Part Numbers: R45TS CR43TS
Thread Size: 14mm, Seat Style: Tapered, Hex Size: 5/8 inch (16mm), Recommended Gap: 0.035 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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