oztrack logo

25% Underdrive Balancer Kit

*We HIGHLY suggest you click below to give us a call or enquire now for this product as we may be able to give you a better price over the phone or if you enquire below*


A 25% undriven harmonic balancer, also known as a “crank pulley,” is intended to reduce harmonic vibrations in an LS engine’s crankshaft. The percentage denotes the pulley’s size in relation to the factory pulley. As a result, a 25% undriven harmonic balancer has a 25% smaller diameter than a factory pulley. The primary benefit of using a smaller harmonic balancer is that it reduces the rotating mass of the crankshaft, which can improve engine performance. Reducing the rotating mass of the crankshaft allows the engine to rev faster and respond to throttle inputs more quickly, which can lead to improved acceleration and overall performance.

Calculate Your Upgrade Budget

Planning to enhance your vehicle’s performance with Oztrack? Use our Loan Calculator to estimate your upgrade budget. Discover convenient financing options through our partner, Verified Lending, and bring your dream upgrades to life. Start calculating today!

Use our Equipment Finance Calculator Powered By Verified Lending



This video does not exist.

Period Payment Interest Balance

Calculator Disclaimer

The repayment amount shown using this calculator is an estimate, based on information you have provided. It is provided for illustrative purposes only and actual repayment amounts may vary. To find out actual repayment amounts, contact us. This calculation does not constitute a quote, loan approval, agreement or advice by Verified Lending. It does not take into account your personal or financial circumstances.

Enquire Now

Name *
Email Address *
Phone Number *
Vehicle Make
Year Of Manufacture
Holden Vehicle Model
Ford Vehicle Model
Jeep Vehicle Model
Chrysler Vehicle Model
Product or Service Interested In *
Message *

You May Also Like

Shopping Cart
Edit Content