SBC 283-400 ci water pump pulley, double groove, for short water pump. 6.6" diameter, Satin aluminum. Also available in polished aluminum part #S9479POL & in chrome aluminum part #S9479C. (Email or call for availability on chrome aluminum pulley before ordering)

TECH. TIP:
Don't know whether you have short or long? Indication is if your alternator is on the drivers side of the engine then it's a short water pump, if it's on the passenger side then it's a long waterpump.Note also if you can fit your hand between the waterpump & the timing cover then you have a long waterpump.