Newbie here. Just upgraded to the big block radiator from the original small block radiator in my '90 Burb. The BB fan shroud stops just prior to the fan blades, so I'm going to need to make an extension about 3-4" long, in order to bring the shroud out past the blades the way the OE shroud was built. So the question was raised, "Why not convert to electric fans?" Been thinking about doing that for a while, but have concerns about whether or not they're able to keep up with the heat load of towing in the mountains, at low speeds, in 90-115*F outside air temps. The Burb's not a daily driver, it's a tower and a hauler so I need it to handle the extremes of our towing a camper on camping trips, where many times we're on a windy 2 lane highway, pulling 7% grades at 25-35mph, in the heat. Is it as simple as: "Go grab a set of fans off a 2010 and you're good to go" or is there more to it? So lets hear from you......even if it's to say, "BTDT, here's my thread."