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Re: Fan shroud for '65 4x4 Big Block
Hey Lee, I used a stock reproduction for mine. I also used the serpentine off of a '97 454, along with the stock water pump and giant steel 7 blade fan (could be 19")with a heavy duty clutch. I used this set up for the old carbureted 396 and for the current FI 454.
The replacement shroud took a little trimming all the way around and a little more on the bottom. On the hottest of days around (109 on Altamont a couple weekends ago) here it will cap off at 215 while towing 6 or 7k lbs. Never any higher and it will come right back down to 190 when at speed. I have a 180 thermostat and original 4 core brass radiator. The clutch locks up when cold for a few minutes and then when needed as it gets hot (above 200 deg).
It never gives any indication of overheating although I wish I could get it down to 160 - 170 deg so the computer is less likely to pull timing.
It does sound like there might not be enough airflow which a shroud should help with. I know it did on mine.
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