Wire Set Spark Plug Marine Mercruiser 7.4 454 Thunderbolt Ignition 84-813720A3

# SMI98102


Fits all Mercruiser 454 7.4L big block engines with the Thunderbolt Ignition System.

This ignition wire set features 8MM suppression core Packard wire custom fit to your specific application.

You can Identify the Thunderbolt ignition system 2 ways. Number one, the riser has an ignition box mounted to it. Number two, the cap has male terminals coming out of the top and the ignition coil is round with a female plug wire connection.

Replaces:84-813720A3

Works with this style distributor:

Thunderbolt Distributor

Brand HP Model Year Cylinders Serial Number Part Notes

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