Re: Carbon Buildup and Stuck Valves
Could be pulling oil in the pcv system. But a stuck valve on a running engine. Carbon would not do that. . So a rig that has set 25 years. How well did you clean the fuel system? A black tar residue could be in a poorly cleaned tank. That will dissolve into the fuel. And it will stick valves like crazy. And if it had copper head gaskets. Use those wuth no worries.
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