The few OE failed fans I have seen all failed at the rivets that held the blades. But all the OE fans I have seen have cupped blades and not the sharp creases like the one in this thread. When a blade does come apart, the potential for damage and injury is very high. The fan I just installed in my 62 Catalina is a 19" 1970 Oldsmobile clutch fan. The blades are a 2" pitch, cupped design. stainless steel blades riveted to a steel hub.
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