This would depend on which engine you have. You can use any terminal on the cap as they are all the same. Number one is determined by which fires number one cylinder in relation to rotor position....
The question may seem simple but it isn't really. I assume you are asking this question because all spark plug wires have been removed and now you don't know where to begin. If you can find the...
Chevy 350 cylinder 1 on top dead center timing mark aligned , rotor should be at 7:00 (standing at front) distributor cap should be square with engine 7:00 should be at #1 on cap
Number 1 cylinder is located drivers side, front of engine. Remove all spark plugs, rotate the engine by hand until # 1 piston is at TDC on the compression stroke. There are several ways to find this...