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Swapping to a V8 also means you need to address the cooling system. The standard six-cylinder radiator (right) was in rough shape, but the V8 requires more cooling anyhow. We contacted U.S. Radiator and got one of their V8 replacement units with the special "optima core" (left). Since the Valiant will serve double-duty and eventually receive even more performance,we needed a radiator to handle the task both now and down the road. In essence, buying it once is better that having to buy another one later.