Which is why you have to size them correctly, run a proper controller and not just a toggle switch, and why they should be an assembly that was designed with their shroud.
My 340 is .060" over, runs 9.8:1 compression with iron heads, has pretty decent sized cam and makes somewhere north of 400 hp with the stock stroke. I've never even come close to overheating with my Ford Contour fan set up, and I have sat in traffic when it was 110°F out.
If your electric fans aren't cooling your engine, you have not picked the right electric fans for your set up.
