What is the firing order for a 1978 Chevy Impala 305?
1-8-4-3-6-5-7-2 THE CYLINDER ARE NUMBERED FRONT TO REAR 1-3-5-7 ON THE LEFT BANK & 2-4-6--8 ON THE RIGHT BANK.look on the intake manifold & U will C some of these numbers 2 give U an idea how the sequence is.
per Chilton's, the firing order of the 78 toro, 403cu in. is 1-8-4-3-6-5-7-2. The same as the 455cu Firing order should be cast into intake in front of carb if you have factory cast iron intake but above answer is right also it has a counter clockwise rotation unlike the corporate engine firing order