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It was entirely possible to have different stuff installed during a warranty replacement. I know of an L78 Chevelle that had an L72 short block installed through warranty. It kind of helped to know the right people I guess.
[/ QUOTE ] I knew first hand of a 69 L78 Camaro that this was done as well.. guy was the Parts Mgr of the largest Chevy store here at the time.. they put another customer's Vette VIN # on the warranty repair ticket..