HARMONIC BALANCER CHEV SMALL BLOCK 283-350 7" REPLACEMENT STREET BALANCER NEW. #PBHB2221-N This item is an ALL NEW 7" diameter replacement standard balancer to suit the Small Block Chev engine Assembly of balancers can result in severe run out conditions and eccentricity of rings and centres. One crude method of correcting this problem is to machine the balancer all over after assembly but this only disguises any misalignment in the rubber and ring. POWERBOND balancers are assembled with extremely accurate tooling, making post press machining unnecessary and every balancer is dynamically balanced at the factory for total peace of mind.