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GRANADA HILLS
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1962-1963 Aston Martin DB4 3.7L L6. 1960-1963 Aston Martin DB4 4.0L L6;Gap 0.025". 1958-1963 Aston Martin DB4 3.7L L6;Gap 0.025". The durable Iridium IX Spark plugs, which enable complete fuel ignition in the combustion chamber via the spark they create, are built to last between 40,000 and 50,000 miles.