The still left flywheel pictured is the earlier Silvertop structure when the correct is the lightened Blacktop. To lower noise the Blacktop belt highlighted a slightly diverse condition teeth profile, That is on the belt only as well as the profile with the drive / driven pulleys(s) stays unchanged and https://4ageblacktopengineforsale57901.digiblogbox.com/64124826/4age-20v-blacktop-for-dummies