PUC-2A-C Pontiac Crank pulley for 3-bolt aftermarket balancer, polished billet, use with 65-70 brackets

Two groove underdrive crank pulley for Pontiac using 3 bolt type aftermarket balancer (ie. ATI super damper or TCI rattler, etc). 6.25" dia Reduces parasitic hp loss with 20% underdrive compared to stock crank pulleys. Two deep grooves for excellent belt seating. Aligns with stock 65-70 accessory brackets (except when using ATI balancer which locates further forwad than stock and will require shims behind bracketry and wp pulley)