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Black sludge/deposits under valve cover - problem?
Long time since I last posted. Searched and didn't find anything that matched what I'm finding. The valve covers on my '86 6.9L haven't been off since the engine was rebuilt in 2010. Since then, the truck ran for a while without a turbo, then got the Banks Sidewinder system installed about 30k...- Ford420
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- Replies: 14
- Forum: 6.9L IH & 7.3L IDI Diesels
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