Sierra’s spark plug wire sets are designed exclusively for marine engines and are the highest quality marine sets available anywhere in the world. Sierra's sets are custom-tailored to each marine engine for a perfect fit. In addition, they have been thoroughly tested to ISO quality standards and will out perform any other marine wire set.
Lead Lengths:
Interchangeable with:
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Sierra 18-5273 Mercruiser Tune Up Kit for V8 Thunderbolt HEI Ignitions Sierra high-quality engine parts are designed to meet OEM specifications. Fits GM V-8 engines with Thunderbolt IV & V...
Add to Cart
Sierra 18-8821-1 Mercruiser Thunderbolt V8 Gen+ Spark Plug Wire Set Sierra replacement engine parts are designed to meet or exceed OEM requirements. This spark wire set is used on Mercruiser engines...
Add to Cart
Mercruiser Thunderbolt V8 Spark Plug Wire Set by Sierra For 8 cylinder engines with Thunderbolt ignition systems. Kit includes coil wire. Kevlar® core for maximum durability and long...
Add to Cart
Sierra 18-8828-1 Wiring Plug Set For Mercruiser 5.0L MIE MPI V8 with Delco HEI ignition system. Sierra replacement engine parts are manufactured to meet or exceed OEM requirements. Ignition Type:...
Add to Cart
Sierra 18-8836-1 Mercruiser V8 Spark Plug Wire Set Sierra high-quality engine parts are designed to meet OEM specifications. For Mercruiser 350 MAG MPI SKI with Delco HEI ignition system...
Add to Cart
Mercruiser Distributor Cap V8 Thunderbolt Ignition by Sierra Includes Gasket Replaces: Mercrusier 16457A4,805759T2,805759T1,...
Add to Cart
Sierra 18-5431 Mercruiser V8 Rotor Assembly Sierra high-quality engine parts are designed to meet OEM specifications. Fits GM V-8 Engines with Thunderbolt IV & V Ignition. Interchangeable...
Add to Cart
Ignition Coil for Thunderbolt Mercruiser & Crusader Ignitions Replaces: Crusader 37068 Mercury 392-805570A2, 392-7803A4, 392-7803, 3000-8M0079202,...
Add to Cart
