Measuring the difference 67-69 Firebird & Camaro Radiators. As the cars are fitted with 20 & 23 inch wide radiators.. this is the measuring point.. not outside of tank to outside of tank etc.... 23 inches is about 580cm. You can have 3 or 4 core in either sizes too. Your factory Radiator support.. has the bolt in patterns already set in it for accepting either width outer mounting locators.

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