I have included a picture with dimensions of the Derale 26 Inch Dual High-Output Electric Radiator Fan-and-Shroud Assembly, # D16927.
If the Derale 26 x 18 Inch Dual High-Output Electric Radiator Fan-and-Shroud Assembly, # D16927, covers at least 80 percent of your core (fin area only, not including tanks) this is the correct part for your 1970 Chevrolet Nova with the big block. view full answer...