United Marine 102 Thunderbolt Big Block Spark Plug Wire Set – Mercruiser 454/502

Complete 8-wire set plus ignition coil wire for Mercruiser big block V8 marine engines with Thunderbolt ignition systems. 90° boots on spark plug ends; 90° boots on both ends of coil wire for clean routing and secure fit.

• 8 mm blue SSC 100% silicone jacket – 500 °F heat rating, high tear strength
• Ultra-low 270-ohm/ft carbon-latex core for maximum spark energy
• Superior EMI/RFI suppression prevents tach bounce, radio static, and ECU interference
• Heavy-duty molded boots maintain dielectric strength in wet/salt environments
• Stainless steel + brass snap-lock terminals resist corrosion and arcing

Fits:

• Mercruiser 454 cu. in. (7.4L) and 502 cu. in. (8.2L) big block V8 engines (1982–1998) with Thunderbolt ignition

Replaces:

• Mercury 84-43376A2, 84-816608Q61, 84-42841A5, 84-43376A14, 84-43376A1, 84-43376A2, 84-813720A2, 84-816761A15, 84-816608A61

Manufacturer Part No.: 102 Brand: United Marine Availability: In Stock – Ships Free (when order qualifies) Hazmat: No