Re: Radiator to fan clearance
My 57 has very little clearance between the water pump and radiator. It's roughly 3/8" which was not enough for me to feel comfortable using a mechanical fan. I opted for an electric pusher fan triggered by a thermostatic switch.
Even if you find a mechanical fan that works, you might want to consider an additional electric fan to help improve airflow over the condenser at low speed and idle.
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