Holley U-Groove Electrode Spark Plugs Accel Pack of 2 (MFG# 2401) Fits Big Twin Cold Plug 1948-74 HD # 3-4 MFG# 137 HD# 32301-60 .025" Gap

Weight: 0.29 The best plug money can buy. Manufactured for your motorcycle exclusively by the most innovative spark plug manufacturer in the world and warranted by Accel. Blister packs of 2 are packaged. Boxes of 10 are individually packaged in protective boxes and the boxes of 24 are not individually packaged. Features of Spark Plugs: U-Groove Ground Electrode: Unique U-Groove develops a larger spark for more complete combustion Insulator and Five-Rib Construction: Insulator made of highly purified alumina powder superior in strength and thermal conductivity Copper Glass Seal: Glass and copper bond the center electrode to the insulator to ensure a gas-tight seal Electric Heat Seal: Ensures a stable heat range Copper Core Center Electrode: Copper Core Center Electrode: Copper surrounded by nickel-chrome for superior conductivity Machine Rolled Threads: For trouble-free spark plug installation and removal Accel Blister Pack of 2 (MFG# 2401) Fits all Big Twin Cold Plug 1948-1974 Replaces HD Code # 3-4 MFG# 137 (Each) Replaces HD# 32301-60 .025" Gap By: HOLLEY PERFORMANCE PRODUCTS,INC.