Holley U-Groove Platinum Spark Plugs Fits Harley 1200cc & 1340cc Shovelhead Hot Plug 1977-81 & 1340cc Big Twin Evolution 1984-99 HD Code # 5R6A HD# 32311-83 (2 Pack)

Weight: 0.33 Manufactured from the best materials available for long, trouble-free operation The premium quality platinum tip is more durable than standard plug material so the spark plug will maintain the proper gap much longer The pure copper center electrode reduces fouling The proper spark plug gap requires less voltage to fire so you will have fewer misfires for long periods of use Easier starting, improved fuel economy, smooth idling and quicker acceleration are just a few benefits of Accel platinum spark plugs Key Features: Platinum Tip Center Electrode: Bonded to massive copper core for superior conductivity and power U-Groove Ground Electrode: 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 powder bond the center electrode to the insulator by electroforming process to assure a gas tight seal Electric Heat Seal: Seals tighter for a stable heat range Machine Rolled Threads: For trouble-free spark plug installation and removal Accel 2 Pack (MFG# 2410P) Fits 1200cc & 1340cc Shovelhead, all models with Electronic Ignition Hot Plug Late 1977-1981 & 1340cc Big Twin Evolution Electronic Ignition Hot Plug 1984-1999 Replaces HD Code # 5R6A Replaces HD# 32311-83 .040" Gap, (Imported) By: HOLLEY PERFORMANCE PRODUCTS,INC.