Review on Enhance Performance with Sierra International 18-5274 Tune Up Kit for Mercury Thunderbolt HEI V-6 (Display Package) by Brent Webb

Name: Enhance Performance with Sierra International 18-5274 Tune Up Kit for Mercury Thunderbolt HEI V-6 (Display Package)
Item: Enhance Performance with Sierra International 18-5274 Tune Up Kit for Mercury Thunderbolt HEI V-6 (Display Package)
Rating: 5

September 02, 2022

Worked on my 4.3 liter Mercruiser with lightning fast ignition.

Worked on my 4.3L Mercruiser with flash ignition. The button was firmer than the OEM and I had to press hard. It's a little harder to feel where it's aligned because it was so tight.

Pros