I took the 4 blade fixed fan out of my 350 FB & put in a 5 blade clutch that was found at a flea market. I bought a new GM shroud from PY and it never goes over 190' with a 180' stat regardless of heat & traffic. I think there should be room for another 1/4" on either end, but won't be able to measure until late Thurs. or Fri.
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Wally
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