United Marine 111 Thunderbolt V6 Spark Plug Wire Set – Mercruiser GM 4.3L

Complete 6-wire set for Mercruiser 262 cu. in. (4.3L) V6 engines with Thunderbolt ignition systems. 90° boots on both distributor cap and spark plug ends for clean routing and secure fit.

• 8 mm 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 4.3L V6 (1985–2003) with Thunderbolt IV/V/HEI distributors (male top studs, round coil)

Replaces:

• Mercruiser 84-816761Q16, 84-816761T16, 84-816761A16, 84-816761A11, 84-813720A11, 84-43376A11
• CDI 631-0013
• Sierra 18-8810-1

Manufacturer Part No.: 111 Brand: United Marine Availability: In Stock  Hazmat: No