Re: 1950 Flathead 6 Radiator
3/8" or even a little less is common. My stock flathead V8 was .410" away from the fan blades. But with my aftermarket radiator it is now about 5/16 (.312").
The closer the better (on a car). Cars are more rigid than old pickups. I wouldn't want mine any closer than that if it was a truck.
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