another 360/408 over heating

Toss the original fan put one of these You can buy them at oriellys , you don't need a fan clutch plus they are too tight in an early a body. There like 30 bucks. Make sure it's as close as it can be to the radiator there are different shape spacers

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Personally, I wouldn’t recommend using a flex fan to anyone, these fans have repeatedly been responsible for vehicle damage and worse still, serious personal injury.
They are a ticking time bomb - DO NOT USE!