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Chevy found out quickly that it wasn't cooling the high heat BB motor and switched to a no clutch 5 bladed piece for 69 and 70.
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Good info Sully. Quick question though: didn't they use the clutched fans on the other BBC models? I know on the Camaro they used the clutched 7-blade, so wouldn't they have the same cooling issues, since it's virtually the same setup? It looks like there isn't room for that setup on our Nova, so it's gonna requires something non-clutched...what is eating up the room? Is it the radiator support?
