CHAMP · Part number RV15YC4 · NZ$15.00 incl. GST
For your classic Kiwi V8 muscle car or trusty American workhorse, spark plugs are the unsung heroes of your ignition system, firing up that air-fuel mix to unleash all that grunt; if they're a bit knackered, you'll feel it in misfires, a rough rumble, and a thirstier engine, but luckily, this Champion option, stocked.
NZ$15.00 including GST. Part number RV15YC4.
Spark Plug Replacement Guide — Keep Your Classic V8 Singing Sweet!
> Right then, let's talk spark plugs. These little beauties are what ignite that bang-on mix of air and fuel in each cylinder, pushing your classic V8 down the road. But after thousands of high-voltage zaps, those electrodes wear down, leading to a weak spark and incomplete combustion. For your beloved Aussie Falcons, iconic American Corvettes, or that trusty Chevy truck, keeping fresh plugs in means you'll be getting every last bit of power and keeping those thirsty engines running as efficiently as possible. Trust us, it's a no-brainer!
Symptoms That Led You Here
• Engine misfires or stumbles under acceleration
• Rough or lumpy idle, especially when cold
• Noticeably increased fuel consumption
• Difficulty starting, particularly in damp NZ mornings
• Check engine light illuminated (on later models with OBD)
• Loss of power climbing hills or towing loads
Will it pass WOF?
Spark plugs themselves are not a direct WOF inspection item, however a misfiring engine can cause excessive exhaust emissions which will fail the visual smoke test. Severely worn plugs on classic V8s often produce black smoke or unburnt fuel smell that inspectors will flag.
DIY or Workshop?
Difficulty: 4/10 — Classic V8 engines with longitudinal layouts offer excellent spark plug access compared to modern transverse engines. Time: 45-90 minutes for a full set of 8 plugs. Tools required: Spark plug socket (typically 13/16" or 5/8"), ratchet with extension, torque wrench, anti-seize compound, and feeler gauges for gap checking. The main challenge on these older American and Australian V8s is ensuring correct plug gap and not cross-threading into aluminium heads.
Expert Recommendation
Bob and the CARFIX team recommend replacing spark plugs every 30,000-50,000km on these classic V8 engines, or sooner if you notice performance degradation. These older ignition systems demand consistent spark to run smoothly, and fresh plugs transform throttle response and fuel economy. Whether you're keeping a numbers-matching Corvette concours-correct or just want your Falcon daily driver running sweet, we've got you sorted. Bob @ CARFIX is always on hand to help you work out exactly what plug spec and gap setting suits your classic V8. Make sure you head over to Bob's Shop for a chat!
Fitment Notes
• Covers Ford Falcon and Fairmont 302ci and 351ci Cleveland/Windsor V8s (1976-1983)
• Suits Chevrolet small-block applications including Corvette, C20, and K10 trucks (1973-1988)
• Also fits Ford LTD V8 and De Tomaso applications
• Always verify plug gap specification for your specific engine tune — factory gaps vary between carburetted and EFI applications
• Some aftermarket ignition upgrades may require colder heat range plugs
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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.