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If coil temperature reached a point high enough to melt the sheaths on the internal windings, potential contact could create a short within the coil. Replacement of the coil was not cheap either. According to the April 1983 Pontiac Master Parts Catalog, where a new HEI coil from GM had a list price of less than $35, the Unitized coil was over $200. With replacement parts costs so high, it quickly becomes apparent why so many Unitized distributors were replaced with points-type or HEI after component failure.