SET OF 8 AUTOLITE DOUBLE PLATINUM SPARK PLUGS TO SUIT HOLDEN 253 304 308 4.2L 5.0L V8Inspired and used within NASCAR, these premium Double Platinum spark plugs are for the enthusiasts with high performance applications in mind. These superior performing spark plugs feature platinum to platinum firing and eliminate gap erosion, reduce misfires, and provide improved durability. The new Autolite plugs ignite more gas and air mixture inside the cylinders to deliver better overall performance. The ignition is also more focused, which