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Re: Barrel shroud
On my '61 Suburban, I went with the largest 7-blade clutch-style fan I could find at YearOne (ended up being big block A/C Mopar). The clutch will let it free-wheel at highway speeds and helps with MPG.
More blades will keep it cooler. I didn't have a shroud on mine, and it kept the radiator cool in Atlanta summers. The large diameter was close to the perimeter of the shroud I had, but never got around to installing.
Measure your shroud's opening, and find a 7-blade fan that's close to that size.
You can get a different length spacer between the crank pulley and the fan, too. That'll be he easiest way to do it with the parts you currently have.
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'61 Suburban daily driver: off the road due to 180-pound 8-pt buck!
'62 K-10 long-step project
'61 C30 Camper, aka "Valdez"
There's no cool like Old School
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