Seven Blade Fan Issue

I had a 7 blade fan on my 340 when I took it to the chassis dyno shop. During the power pull, the water pump snout broke off! Fan blade imbalance! These things are heavy!I would purchase a new MP 5 blade clutch fan package. It should cool fine for all engines with a good radiator. I put on the 7 blade because I was overheating with a 4 core desert cooler radiator. Couldn't understand why the engine overheated all the time and thought it was the fan. Turned out I needed the radiator rodded out. I had it boiled out a while ago, but that isn’t sufficient to clean out built up deposits.So, the moral of the story is, check everything out before you go with heavy power robbing parts like a huge 7 blade fan that was made to cool a BB station wagon towing a trailer.