Butler AAC 2pc Harmonic Balancer/Dampers, 59-67 Pontiac 6-Bolt, AAC-630155

-Includes Six Grade 8 Pulley Bolts and Crank Key. Extended Hub works with later crankshafts w/longer snouts Performance 2-Piece Harmonic Balancer for Early Pontiacs that require a 6-bolt, 2 piece harmonic balancer/hub. The balancer bolts inside of your pulley Pontiac 1959-67 6-Bolt Performance Damper 2-Piece Assembly Performance 2-Piece Harmonic Balancer for Early Pontiacs that require a 6-bolt, 2 piece harmonic balancer/hub. The balancer bolts inside of your pulley (pulleys not included). Very High Quality Unit. **1968 and Later TC- First Mark Clockwise is 0 Timing Mark. Disregard second mark when using 1968 timing cover. We recommend using an adjustable timing light to set timing** **1964-67 TC- First Mark Clockwise is 6 Timing Mark, Second Mark is 0. We recommend using an adjustable timing light to set timing** This balancer will work with earlier model (short snout) cranks as well as later model and aftermarket (longer snout) cranks.