Hi Marco, nice willys, If you have the room to use a pull style fan then do that but if your water pump is to close then you can run a pusher. You need to make shure that the complete system is in exlant working order. I had to go pusher my system has a Stewart water pump stage 2 Griffin radiator 24x19 2 rows 1.25 tubes and a 16" becool electric fan Ron Frances switch on at 200 off at 185 running a 180 tstat. I have not had one problem so far and I'm cooling a stout 383 stroker, when it is cold in the morning 40< the temp wont go past 160-165