351C Small Block Engine Spark Plug
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A spark plug reading reveals incorrect heat range along with oil contamination and a rich mixture, which translates into a loss of performance and poor fuel economy. The rich mixture probably saved this engine from major damage because ignition timing was also too far advanced. By nature, 351C engines detonate due to poor combustion chamber design (poor quench). Timing advanced too far only aggravates the problem. View Related Article
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