Powerbond Street Performance harmonic balancer PB1111STPowerBond Street Performance Harmonic Balancers PowerBond Street Performance harmonic balancers bring bonded balancer technology within the budget of every performance street engine builder. They are also perfect for limited spec race classes, such as late model stock that require an OEM style balancer. The bonded dampening rubber in every balancer eliminates spinning and component separation giving reliable performance in engines used up to 6,500