Re: COPO fan clutch problem
Our '69 L78 Chevelle has about 2" between the fan and the 3 core rad. A four core should be a good fit as well. Better than an inch of the fan is out of the shroud. All '69 and later Chevelle's ran the long water pump setup. Our COPO Chevelle came with the BO 3 core radiator and I believe that this same rad came on the L78 cars.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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