looked this up on napa site
Spark Plug - V Power
Front
Part: NGK 2635 Product Line: NGK
Features & Benefits
V-Grooved Center Electrode Offers Lowers Ignition System Voltage, Better Ignitability, Increase Fuel Economy, Lower Emissions, Increased Anti-Fouling Characteristics
Attributes
Spark Plug Hex Size : 13/16"
Spark Plug Reach : 3/4"
Spark Plug Seat Type : Gasket
Spark Plug Thread Size : 14 mm
Warranty
NGK Spark Plugs Warrants Its Product To Be Free From Defects In Workmanship And Materials. In The Case Of Damage Or Defect Attributable To NGK, The Distributor Or The Customer Can Make Claim Against NGK For Any Damage Or Defective Product Or Part.
Application Information: 1967 Dodge Dart
Engines : 4.5 L 273 CID V8
Comments: @Gap .035"@
Per Car Qty.: 8