Total Price:
Add to CartSierra high-quality engine parts are designed to meet OEM specifications. Fits GM V-8 engines with Thunderbolt IV & V HEI ignitions.
Kit Includes:
Interchangeable with:
What is the Sierra 18-5273 MerCruiser Tune Up Kit used for?
The Sierra 18-5273 MerCruiser Tune Up Kit is designed for GM V8 engines equipped with Thunderbolt IV and Thunderbolt V HEI ignitions. Sierra engine parts are designed to meet OEM specifications, and this kit provides the listed components for a tune-up on compatible applications.
What engines is the Sierra 18-5273 tune-up kit compatible with?
The Sierra 18-5273 is designed to fit GM V8 engines with Thunderbolt IV and Thunderbolt V HEI ignitions. The supplied product description does not specify individual engine models, years, horsepower ratings, or serial-number ranges, so those details should be verified before ordering.
What is included in the Sierra 18-5273 MerCruiser Tune Up Kit?
The kit includes a Sierra 18-5431 rotor, 18-5395 distributor cap, and a gasket. The product description also lists Voltage Regulator 18-5710 separately, but it does not identify it as part of the kit includes list.
Which parts are interchangeable with the Sierra 18-5273?
The Sierra 18-5273 is listed as interchangeable with GLM 71780, Mercury 805759Q3 and 805759T3, Mallory 9-29350, Pro Marine 64759K, and Redline RL5273. Verify the application and ignition configuration before using an interchangeable part number for your engine.
What type of ignition does the Sierra 18-5273 support?
The Sierra 18-5273 is designed for Thunderbolt IV and Thunderbolt V HEI ignition systems on GM V8 engines. The product description does not provide installation instructions or additional ignition-system requirements, so follow the applicable engine service information when installing the tune-up components.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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