1984 Chevy 350 amazing power! I wouldn't use any other spark plug in my hot rod engine, these plugs really stand up to the heat that those old engines put out. I only exchanged mine because of the long time, I had installed the previous one for 2 1/2 years without any dirt or misfires. Pulled them out, they were still in good condition but replaced anyway. My truck is a Chevy P 30 converted to a party bus. The engine has a lot of mileage and a lot of weight... I love these plugs!
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