Tune up kit for Mercruiser 5.0, 5.7, 7.4, 8.2 V8 engines with Thunderbolt Ign...
Includes spark plug wires, distributor cap/rotor, and 8 MR43T spark plugs. Eight AC Delco MR43T spark plugs. Check your engine cover to ensure these are the correct spark plugs for your engine before ordering.