Actually, it is true, if you don't want the radiator to be over taxed. This has been the rule of thumb for decades.
You and the rest of these guys run your cooling system however you want to. It doesn't bother me. I always chuckle when I see these threads anyway, because nobody ever listens.
I EXPERIMENTED W/ ABOUT EVERYTHING BUT A CONTOUR FAN LAST SUMMER , NO ELEC. I tried worked , even had 2 pullers and a pusher on it at once. Keeping 505'' cool in okla. heat , in an engine bay thats too small to start with aint easy .
Coated headers might help some , but qaint in the budget. The under hood heat is so high that its deformed/melted the hood vent on the pass. side.
