DESCRIPTION Water Pump Pulley --Pulley diameter is 6 5/8". --Pulley is 3" tall. --Bolt pattern is 1 3/4". --Center hole is 5/8". --Double groove. Crank Pulley --Fits Small Block Chevy 265 283 305 327 350 383 400 using a short water pump --Pulley diameter is 6 9/16". --Pulley is 3/4" tall. --Bolt pattern is 2 3/4". --Center hole is 1 1/8". --Machined from billet aluminum. Package: Including all items in the picture. Note: Professional Installation is Highly Recommended.
