1988-1991 C4 L98 ACDelco Spark Plug FR5LS
If your L98 has been getting a little grumpy on cold starts or feels like it’s lost that punch it used to brag about, these 1988-1991 J-Series ACDelco FR5LS spark plugs are exactly what the doctor ordered. Think of them as the reliable old friend who shows up on time, doesn’t complain, and fires off every cylinder like it's still 1990. With a copper core for solid heat transfer, a hot-tip insulator that gets to work fast, and nickel-chrome electrode materials that hold up to the combustion chaos under your hood, these plugs keep your Corvette running crisp and clean. They help prevent low-speed carbon fouling, deliver consistent spark, and give your L98 the dependable ignition it needs to feel alive again. If you want smooth idle, better response, and no-nonsense reliability, these are the plugs your Vette deserves.
- ACDelco FR5LS spark plugs for 1988-1991 Corvette L98 engines
- Copper-core electrode improves heat transfer and reduces carbon fouling
- Hot-tip insulator provides quicker warmup and stronger low-speed performance
- Nickel-chrome alloy resists spark erosion and combustion chamber corrosion
- OEM equivalent part numbers 05614106 and 5614106
Also known under these part numbers: (For reference only)