Product Description Suits SBC chevy 265 283 305 327 350 383 400 using a short water pump. The pulley diameter is 6 9/16". Pulley is 1 3/8" tall. The bolt pattern is 2 3/4". The Center hole is 1 1/8". Machined from billet aluminum. Package Description Including all items in the picture. Professional Installation is Highly Recommended (No Instruction Included).
