Sierra 18-8837-1 Spark Plug Wire Set

For Mercruiser Models: 420; 8 cylinder; O.E.M. # 84-847701Q7; Ignition Type: Thunderbolt Model 425; 8 Cylinder; O.E.M. # 84-847701Q7; Ignition Type: ThunderboltPremium Marine Wire Leads Magnetic Suppression Core Manufactured for your specific application Kevlar® core for maximum durability and long life. Durable stainless steel wound conductor for maximum horsepower and engine performance. Premium silicone jacketing and boots for the ultimate in high temperature protection. Superior RFI suppression for the most sensitive electronic system. Corrosion resistant stainless steel spark plug and distributor terminals for maximum conductivity.