Replacement Harmonic Balancer HB1451-N PBHB1451-N Suit BB Chev 454-502 MK5, External Balance BB CHEV 454 502 MK5 HARMONIC Dayco POWERBOND OEM Replacement Balancers offer engine repairers the option of a totally new assembly featuring high grade SG iron castings assembled with new inserted or bonded rubber as used in the original balancer. They are available for many popular passenger cars, light commercial and 4WD applications as listed in our applications section. These totally new balancers do not attract a deposit charge and core return is not required.