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I would doubt the #4 was intended as a label for the #4 spark plug wire. It is more likely a date code, or a mold mark. Generally, if a cap is marked, #1 is marked. (Of course, after following the procedure below, #4 wire may, in fact, go to the terminal marked "4"!) Be sure the ignition switch is "OFF", and ground the high tension wire from the coil to be safe. Have an assistant slowly turn the engine in the direction of normal rotation as you hold a finger OVER the #1 spark plug hole,(The clyinder nearest the radiator.) When #1 is coming up on the firing stroke, you will feel compression pressure blowing your finger off the spark plug hole. As the #1 piston reaches TDC, and begins to go down again, the feeling of pressure will change to suction. Turn the engine backwards slightly, to the exact spot where the feeling of pressure dropped off, just before the feeling of suction started. This is #1 TDC. If the distributor timing has not been disturbed, the points should have just opened, and the distributor cap nipple the rotor is pointing to connects to the #1 spark plug. Arrange the other 3 plug wires, in firing order, around the distributor cap, in the direction of distributor rotation.
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