You are right. There would be a special engine code as the engine would have come from Tonawanda with the clutch already installed. The salesman told me that the clutch was available but then again he wasn't very well versed on the COPO options either. Were there any special codes for the MA6 in the L78 Chevelle, Nova, or Camaro?
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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.