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FYI: also measure the diameter of the fan you are going to use.
Most newer style motors use a fan/fan clutch assm. The diameter
of newer fans wont fit into the older SBC fan shroud. If I remember correctly, the SBC fan shrould opening is 19" and the
BB shroud opening is 21"
Might want to consider using a BB fan shroud, it has a larger
opening, and isnt too thick. If you run across the 305-V6 GMC
fan shroud, it is even thinner and has the larger opening like the
BB fan shroud.
Good luck.
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