Small Block Chevy 6.12″ internal balance, iron, orange paint, elastomer design, applications 283/307/327/348 CID 1955-1976 yrs. Professional Products’ Restoration Harmonic Balancers provides enthusiasts who are restoring older model vehicles with a very cost-effective balancer that is visually and mechanically identical to the Original Equipment balancer. The dimensions and timing marks are the same. Please e-mail with questions.