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ACDelco has a "totally correct" spark plug for your Firebird's engine. Sure, others work, but none will perfectly complement the ignition system. ACDelco spark plugs are designed to achieve the optimum in engine performance when used in connection with ACDelco's total ignition system. In fact, the spark plugs even use a special resistance in the plug just for your engine so that radio interference is minimized. Insist on genuine ACDelco spark plugs.
NOTE: These Spark Plugs are Pre-Gapped. Attempting to gap will damage these plugs.
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov