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Had that happen in 1972 when the fan blade on my 8RT flew apart going thru the hood of my 40 and into the radiator. My conclusion was that over the many years and cycles of flexing those OEM fan blades work harden, crack and break. I was standing next to the car "giving it gas" when it happened. Could have cut my head off. Installed new stainless blade and it's still going strong. Fan pulley is home made. I know there are those who say fan blade breakage is a rarity but, in this case old is not gold.