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What is the firing order for a 1978 Chevy Nova?

The firing order for a 1978 Chevy Nova depends entirely on the engine it has. Chevy Novas of that year came with a variety of engines (inline-6, small-block V8, and possibly even a larger V8 in some models). There's no single firing order.

To find the correct firing order, you must identify the engine's displacement (e.g., 250 cubic inch inline-6, 305 cubic inch V8, 350 cubic inch V8, etc.). Once you know the engine, you can then look up the firing order in a repair manual specific to that engine or online resources such as a Haynes or Chilton manual, or an online automotive database.