NGK Spark Plugs · Part number BR6FS · NZ$18.00 incl. GST
If you're running a classic American V8 legend.
NZ$18.00 including GST. Part number BR6FS.
Spark Plug Replacement: Keep Your Kiwi Classic Roaring!
> Right, let's talk spark plugs – these little beauties are what get your engine's party started, igniting the fuel-air mix in those big combustion chambers. For your classic American V8, whether it's a trusty Chevrolet C-Series ute or a sleek Corvette, worn-out plugs mean misfires, a rough idle, and that gut-wrenching feeling when she just won't start on a chilly Kiwi morning. These big-hearted engines from the 70s and 80s absolutely demand a consistent, powerful spark to keep that legendary torque and reliability humming along.
Symptoms That Led You Here
• Engine misfires or runs rough at idle
• Noticeable drop in fuel economy
• Difficulty starting, especially in cold or damp NZ conditions
• Sluggish acceleration or lack of power under load
• Check engine light illuminated (on later models with diagnostics)
• Visible carbon fouling or electrode erosion on old plugs
Will it pass WOF?
Spark plugs themselves aren't a direct WOF inspection item, but the symptoms of worn plugs—excessive emissions, rough running, or failure to start reliably—can cause your classic Chev to fail emissions testing where applicable. Keeping ignition components fresh ensures your vintage American iron stays road-legal in New Zealand.
DIY or Workshop?
Difficulty: 3/10 | Time: 30-60 minutes | Tools: Spark plug socket (typically 13/16" or 5/8"), ratchet, extension bar, gap gauge, anti-seize compound, torque wrench
Classic Chevrolet V8s are wonderfully accessible compared to modern engine bays. The C10, C20, and C30 trucks offer plenty of room around the engine, and even the Corvette's small-block is straightforward with basic hand tools. Gap your new plugs to manufacturer spec before installation and apply a light coating of anti-seize to the threads.
Expert Recommendation
Bob and the CARFIX team recommend replacing spark plugs every 20,000-30,000 km on these classic engines, or sooner if you notice performance degradation. The NGK BR6FS is an excellent choice for these applications—NGK's copper-core construction delivers reliable spark and heat dissipation that these older V8s thrive on. Bob @ CARFIX is always on hand to help you work out exactly what plug heat range and gap specification suits your classic Chev. Make sure you head over to Bob's Shop for a chat!
Fitment Notes
• Confirmed fitment for Chevrolet C10 (1974-1981), C20 (1974-1986), C30 (1974-1986), and Corvette (1970-1971)
• Always verify engine size (350, 400, 454 etc.) as plug specifications may vary between small-block and big-block applications
• These classic trucks often have modified engines—check your current plug type if previous owner made performance upgrades
• Corvette applications may require removal of exhaust headers for rear cylinder access on some configurations
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🛠️ Bob's Pro Tip: Do the Job Right!
> If you're replacing this spark plug, make sure you've got the right workshop prep, protection, and safety gear ready. Taking a bit of extra time and using the proper safety stands and cleaners makes all the difference for a professional result!
🧰 What Else You'll Need:
• Safety First: Always secure your vehicle on heavy-duty safety jack stands before working underneath. Never rely solely on a hydraulic jack.
• Clean Hands: Keep a pack of Nitrile Gloves handy to protect your skin from grease, oils, and chemical sprays.
• Preparation: Have microfibre towels and a suitable parts cleaner nearby to keep components clean during installation.