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Re: Gonna cost me more $$
The problem with many lower cost fans is the advertised CFM rating is achieved at 14 or 16 volts. In the real world where they are running at 13.5 to 12 volts the CFM they move is lower.
In my opinion 2400 CFM is the lowest I would use on a 400 cubic inch stock engine. On my 401 AMC which is around 310 hp at the rear wheels I have four 1200 CFM Spal fans using a 2 row 1 inch tube aluminum radiator to keep it cool in traffic all year long.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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