Porsche 911 fan kit , which crank pulley ?

[itHaKa]

Hi

i have a Porsche 911 fan kit, with a real 911 fan/shroud on a type 1 engine , the kit came with a 5 inch power pulley, would like to know which pulley size you are using

options i am considering are

Gene Berg steel 1:1 pulley 4-1/4"OD
5 1/4 dry sump pulley
6 inch power pulley
7 inch stock pulley

i would like to try how they affect engine cooling and hp increase/loss

[itHaKa]

just for someone that might be interested

Sharpbuilt kit uses a 5 inch pulley
GWD recommends a 5,7 - 6,0 inch pulley

[powerbug]

Since you live in Argentina and ambient temperatures might be high you should aim for a 1.6:1 ratio between bottom pulley and fan pulley.