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Before you start the engine see if the fan will turn freely and not wobble. If it wobbles or doesn't turn it isn't any good. First though, are you sure it has a fan clutch. That would be pretty rare on a 65 model. To make sure check the front of the fan and see if it has a large aluminum piece on it. If not you don't have a fan clutch. Now assuming you do have a fan clutch and the fan shroud is still in place drive the car until it is at operating temperature. Shut the motor off and check the fan. It should only turn a couple of times before it stops when the engine is at operating temperature. Good luck.

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Q: How do you test a fan clutch on a 1965 Chevy 327 engine?
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