I believe that the exhaust manifolds were different on the LT1 Camaro and LT1 Corvette engines. I have many documented 1972 Camaro Z28 motors repurposed for Corvette usage when the Camaro plant went on strike. Sometimes the assembly code was ground out and sometimes the Corvette LT1 code was hammered over the Camaro code. The date was never altered. I have 20 examples in my files for repurposed motors.
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