Spark plug set 847701Q7 is for use on V8 MerCruiser high performance engines (454, 502, 540 and 572 CID) with Thunderbolt IV ignition systems (1990 and newer). Quicksilver is the premier supplier of Mercury Marine original equipment replacement engine parts, providing performance, protection and peace of mind.
- Complete set of blue wire spark plug wires with boots at spark plug end
- Tailored to reach the correct plug location
- Designed for efficiency, endurance and durability in a marine engine environment
- Fits MerCruiser high performance engines with Thunderbolt IV ignition
