****V8 engine needs 8 plugs so it’s advisable to get 2 sets**** Thread Diameter: 12mm Thread Pitch: 1.25mm Seat Type: Gasket Reach: 26.5mm (1.04") Hex Size: 9/16" (14mm) Terminal Type: Solid Overall Height: ISO Gap: .039" (1.0mm) Center Electrode Material: Iridium Type: Fine Wire Size: 0.6mm Projection: Extended Projection Ground Electrode Material: Platinum Type: Standard Quantity: 1 box Specifications Resistor: Yes Resistor Value: 1K Ohm Heat Range: 7 Torque Specs Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.