Bosch Spark Plug P/N:9659

Deliver dependable ignition across a huge range of classic GM and Ford engines with the Bosch OE Fine Wire Double Iridium Spark Plug (MPN 9659) — a BOSCH spark plug engineered for both high performance and long life. It drops in as a direct-fit replacement for applications such as the 1988-1995 Chevrolet C1500 and K1500 (V6-4.3L, V8-5.0L, V8-5.7L), the 1990-1996 Ford F-150 (V8-5.0L), and many other Buick, Cadillac, Oldsmobile and GMC models — see the Buyer's Guide tab for the full list of applications.

• Double Iridium electrodes: an iridium center-electrode firing pin and iridium-platinum ground electrode deliver higher performance and up to 4 times longer life than standard copper spark plugs.
• OE Fine Wire design: requires up to 24% less voltage to ignite.
• 360-degree continuous laser welding: increases durability for longer life, while the tapered ground electrode aids ignition throughout the plug's life.
• Copper core center electrode: provides a broader heat range to help resist pre-ignition and fouling.
• Pre-gapped with nickel-plated threads: installs quickly without adjusting the 1.3 mm gap or applying anti-seize.

This resistor-type plug helps suppress radio-frequency interference and features a ceramic insulator, tapered seat, 16 mm hex and 11.2 mm reach (manufacturer heat range 9). Each plug is sold individually (package quantity 1); the number required varies by engine, so order the correct count for your application. Made in Germany and backed by Bosch's 7-year customer satisfaction guarantee and 1-year technician warranty.