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01 With the distributor cap and rotor removed, the Firecore distributor looks like many other electronic distributors. With the Firecore unit, your total mechanical advance is adjustable by loosening the two outboard screws and moving pickup plate as needed. You can also see the advance weights and the factory installed "medium" advance springs. Depending on the timing needs of your engine, the distributors come with two extra sets of advance springs for dialing in how soon your mechanical advance comes in.