CB PERFORMANCE. 40hp 1200cc-1600cc. Made in the USA. High Quality. CNC machined from 356 T6 aluminum billet. Anodized Blue ! 1897. All aluminum pulleys on the market need to be checked and/or machined for case clearance on alumimum cases before running. NOTE: Not recommended for use with Aluminum Engine Cases. Instead use a steel hub pulley or an aluminum Sand Seal Pulley Kit.