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Re: GM 4.8, 5.4, 6.0 Natural gas valvetrain failures
Posted to Technical Discussion Forum on 1/21/2006 1 Reply

Hi James,

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On our '97-'98 GM trucks with the factory CNG system (Impco), the heads have hardened intake seats and iron-faced exhaust valves. This was called the gaseous fuel engine option (RPO KL5) o... Login to read more.

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