Buy thier shroud and when you recieve it measure the diameter of the hole. then choose a correct fan that is about .5 inches smaller in diameter. choos a hydrostatic fan clutch that puts the fan centered in the middle of the opening. not too far inside the opening and not to far outside the opening. Then select a fan from GM's many choices and install it using grade 8 hardware.
I have found that the best fans come frommmid 70's chevy trucks. close in DIA and HD and many fan blades.
That flex-O-Lite fan only flexed open your wallet and lightened it
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