Spark plug set 816608Q61 is for use on vintage V8 (454-502 CID) General Motors marinized engines with Thunderbolt IV and V ignition systems (1981-1997). These red wires are tailored to reach the correct plug locations and are designed for efficiency and endurance. Quicksilver buying is buying performance and protection.
- Complete set of 8 red wires with boots at spark plug end
- Tailored for vintage V8 MerCruiser engines (454-502 CID)
- Designed for efficiency, endurance and durability in marine environments
- Fits engines with Thunderbolt IV and V ignition systems
