Bi-Level Rotor and Distributor Cap
Both the rotor and cap have upper and lower electrode levels. As the rotor turns, one of the high voltage electrode pickup arms aligns with one spoke of the distributor cap center electrode plate, allowing high voltage to pass from the plate, through the rotor to the terminal on the cap and on to the spark plug.
The numbers molded into the top of the distributor cap are wire identification numbers. Due to the unique design of the cap and rotor, the wires ARE NOT arranged in the cap in firing order. The outer ring of numbers is for 351" engine and the inner ring is for 302" engine. Actual firing order for 302" is 1-5-4-2-6-3-7-8 and for 351" is 1-3-7-2-6-5-4-8.
NOTE:
Do not attempt to remove any silicone coating from the rotor lower electrode blades or from the distributor cap electrodes (including the center plate electrodes). With age, this silicone compound has the appearance of being a contaminant of the cap and electrodes. This condition is normal and will not affect the performance.