yes there is a HD cooling one for police cars

8 vanes and a 5/8 shaft larger bearings

it has ribs down the neck,other is like a gatling gun...long tubes down the neck,most times will be a 6 vane

8 vanes non a/c pullys
6 vanes for a/c pullys

both move same x amount of water at idle,8 vane with a/c pully can cause it to cavitate at high rpms(marine engines),ma mopar used 8 vanes on some police cars for the added fan rpms at idle for oil,tranz,PS,rad coolers

they did more idle time/traffic than high speeds like the cruzers

correct size pully help the alt/charging sytems,I have seen cop engines with larger alt pullys before also