Racing Plugs NGK Racing Plug Recommendations Choosing A Racing Plug Installation Guide 2007 NGK Racing Plug Catalog NGK U.S. Racing Plug Chart Special Plug Features Bi-Hex Conversion Charts Displacement Conversion Chart NGK Racing Wires Heat Range Interchange (NGK-Denso-Champion- Bosch) Center Electrodes Fine wire Ultra-fine Taper cut V-Power Ground Electrodes Double Fine Electrode trapezoid Cut back ground Tapered cut Angled ground strap Multi-ground Supplementary gap Intermittent discharge Semi-surface discharge Surface discharge Resistor Types Resistor Inductive resistor Precious Metal Types Platinum Gold palladium Iridium Plug Problems Breakage Erosion Lead Erosion Lead Fouling Melting Normal Plug Wear Overheating Shadowing Corona Stain Fouling Bridging Deposits Pre-ignition Flashover Quenching Plug Properties Thread Reach Hex Terminal Seat Center electrode Ground electrode Copper core Diameter Ignition Anachronism Wasted Spark Ignition Radio Frequency Interference RFI ISO JIS Distributorless Ignition System DIS Capacitor Discharged Ignition CDI Glow Plugs Quick-start type Standard sheathed type QGS sheathed type Self-regulating sheathed type After Glow Ceramic Glow Plugs Oxygen Sensors Signal Planar Air Fuel Sensor Flanged Non-Flanged 1 Wire 2 Wire 3 Wire 4 Wire Cross Count stoichiometric air/fuel ratio Lambda Sensor Titania Universal Oxygen Sensor Zirconia Wide Band Oxygen Sensor 5 Wire Oxygen Sensor Reading old oxygen sensors Oxygen Sensor Diagnostic Testing NTK OE Identical Oxygen Sensor Installation Instructions NTK Universal O2 Sensor Installation Instructions Manufacturer's Numbering System NGK

JIS height ISO height ISO (International Standards Organization) is an international organization which establishes standards for the production of automobiles and their parts. The ISO height for a spark plug from the seat to the top of the terminal nut is 50.5mm (1.98"). JIS (Japanese Industrial Standard) is a Japanese organization which establishes standards for the production of Japanese automobiles and their parts. The JIS height for a spark plug from the seat to the top of the terminal nut is 53mm (2.086").

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