I’m a big proponent of those stainless flex fans, they really move a lot of air at idle. Have a 19” on my 66 GTO, albeit with a large 8” water pulley and a small 6.5” crank pulley to slow the fan down in relation to engine rpm. Runs at thermostat temp in any traffic idle conditions in south Alabama summers.
But I would caution over-driving a flex fan using a small water pulley, which would make the fan spin faster than engine rpm. With my setup at 6000 rpm engine speed, my fan is spinning at less than 5000 rpm. If you use the small water pulley you will spin the flex fan approaching 7000 rpm at that same engine speed, so be aware of that aspect. When Pontiac used those flex fans they were under-driven with large water pulleys
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66 GTO, 495, M22, Strange S-60 w/4.10
Sold new at Royal Pontiac (Dealer# 07-679)
70 Formula 400/auto
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