[sYc]

If any Chevy engine should be billed as the "mystery" engine, it has to be the L-72 used in COPOs in '69. Very few people, including dealers, zone reps, line workers, etc really knew what was going on, because Chevrolet was so secretive about the engine. Making the situation even more confusing was how close the engine was to the L-78, using many of the same parts, including L-78 emissions stickers. Add in no reference to the engine in any Chevy literature at the time and, nothing on the engine or or cars denoting 427. It caused a tremendous amount of confusion then and is still haunting our hobby today. Does make for some interesting discussions/searches though, such as this thread.