Seller notes

Spark plug set 816608Q61 is for use on vintage, V-8 (454-502 CID) General Motors marinized engines with Thunderbolt IV and V ignition systems (1981 through 1997). The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine Original Equipment replacement engine parts, oils, and accessories, but also works to serve all Original Equipment brands in the marine and p...

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