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One question for the experts: I know the L72 was available in big cars in '66,'68 and '69. Why none in 1967?
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Older post, but I thought I'd respond - I had a Champagne '67 SS427 with an L-72 4-speed when I worked at Chevrolet Engineering; it was ordered for the Engineering Product Evaluation Fleet, built at Flint Assembly, and I tagged it and bought it out of the fleet with my employee discount when it got 3,000 miles on it, in December, 1966. It had this tag pop-riveted to the vertical surface of the driver's side fender reinforcement - still have the tag in my "old cars" tool chest. I drove the car for two years while I was at the Chevrolet Pilot Line and sold it in Flint in the fall of '68 when I bought a '69 Caprice 427.
