With Metco's Interchangeable Crank Pulley Package one can increase the boost on their 2012+ Camaro Zl1 without making any permanent modifications. When combined together the total weight of the package is only 12.6 lbs, compared to 16.2 lbs for the factory steel unit. This removes a significant amount of rotating mass from the front the engine leading to quicker acceleration. Boost levels range from 2 to 6 lbs of additional boost and can easily be changed out to increase or decrease boost.

Notes:

• 9.10" & 9.55" rings should use a Metco's 50mm crank idler pulley
• 10.00" & 10.50" rings should use a Metco's idler relocation bracket and the 50mm idler pulley

Supercharger Belt Lengths:

• 8.60″ Crank pulley ring and stock idler pulley: 67.5″ Belt
• 9.10″ Crank pulley ring and 50mm idler pulley: 68.0″ Belt
• 9.55″ Crank pulley ring and 50mm idler pulley: 69.0″ Belt
• 10.00″ Crank pulley ring with 50mm idler pulley and idler relocation bracket: 71.5″ Belt
• 10.50″ Crank pulley ring with 50mm idler pulley and idler relocation bracket: 72.5″ Belt (Estimated)