Sierra 18-5274 Tune-Up Kit for MerCruiser V6 Thunderbolt HEI

Sierra 18-5274 is a tune-up kit for MerCruiser V6 engines with Thunderbolt HEI ignition. Confirm ignition type, engine application, and part number before ordering.

Sierra 18-5274 Tune-Up Kit for MerCruiser V6 Thunderbolt HEI is listed in the Laken Water Sports marine parts catalog for online ordering and Phoenix-area pickup. Confirm fitment, availability, and pickup timing with the parts team before ordering when compatibility is critical.

Fitment notes: For MerCruiser V6 Thunderbolt HEI applications. Confirm Sierra part number 18-5274 before ordering.