My fan measured at about 18 - 3/4", using a tape measure - s/b pretty close. The ID of the Shroud was 20". I have almost 3/4" clearance. I got the shroud from PY over 2 ys ago, original GM from what they told me. Need the clips & bolt / speed nut, not oncluded. Looks like you should be OK, you might want PY to measure the Shroud to make sure the are no areas that have a smaller ID than 20" - hard to do with the fan in place & on the car.
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Wally
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