Radiator and friends installed (Mock-up) without the fan, I didn't think it necessary to install during measurements. It looks like a 18" fan will work just fine. 1/2"- 9/16" between the fan clutch fins and the radiator core. Tight but usable I think.

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Common sense, the least common of all the senses.
Mom.

For fear of ridicule, society stifles creativity.
Ricky Valdes