Re: weird engine manufacture code
There must be a GM book with the engine codes as I have a page showing the E2, E3, and E4, amongst others. Perhaps GM was planning the L78 automatic for the Chevelle and Camaro as well.
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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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