What are the timing specs on a 1968 Corvette?

There's no single "timing spec" for a 1968 Corvette engine. The specifications depend entirely on the engine installed. Corvettes in 1968 offered several engine options, each with its own ignition timing requirements. These requirements were also affected by the carburetor used.

To find the correct timing, you must consult the owner's manual or a reputable Chevrolet shop manual specific to the year and *exact engine code* of your 1968 Corvette. The engine code is usually found on a pad cast into the engine block.

The timing will be specified as degrees Before Top Dead Center (BTDC) at a specific engine speed (usually idle and perhaps at higher RPM). You'll likely find specifications for both initial timing and total timing (after centrifugal and vacuum advance).

Without knowing the engine type (e.g., 327, 350, 427, and their various variations), providing any specific timing specs would be inaccurate and potentially harmful to the engine.