Sierra Tune Up Kit - SIE-18-5273

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 HEI ignitions.

Voltage Regulator 18-5710

Kit Includes:

Rotor 18-5431

Distributor Cap 18-5395

Gasket

Interchangeable with:

GLM

71780

Mercury

805759Q3

805759T3

Mallory

9-29350

Pro Marine

64759K

Redline

RL5273

Frequently Asked Questions

• 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.