This 123 Ignition Distributor is specifically designed to replace Lucas distributors on classic MGA and MGB (4 cylinder) engines using Positive Earth. It offers 16 different advance curves that can be selected via a little switch which enables you to tune your engine to that of a particular Lucas distributor number (see below), plus a curve for 'Stage 2' engines. See also the pdf. It offers automatic dwell, spark balancing and automatic power cut off one second after engine stops to prevent coil overheating. This distributor can be wired to suit both positive and negative earth vehicles.
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