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Old 02-17-2013, 06:21 PM
carpoor carpoor is offline
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Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
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Ok, here is some more clarification now that I have an example of each fan in my posession...

Your common "772" fan:



And a real deal 3999265 72' LS5 cooling fan vs. a 3999260 fan, used on SBC cars from what I can tell. (the shiny one is a 3999260 I restored and will not be using):







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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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