The firing order for a 1977 Chevrolet van depends entirely on the engine it has. Chevrolet vans in 1977 used several different engines (inline-6, small-block V8, and big-block V8). You
must know the engine's displacement (e.g., 250 cubic inches, 350 cubic inches, 454 cubic inches) to determine the correct firing order.
Once you know the engine size, you can find the firing order in a repair manual specific to that engine and year of van, or online through resources like engine repair websites.
