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Mod | | | Forums66 Topics128,031 Posts1,055,436 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | I'd recommend you start with a leakdown test. If it is coming out the tailpipe then it is getting into the combustion chamber(s). That is valves or rings. A leakdown test can help ID if the rings are good or not.
There can be assembly issues (incorrect rockers, incorrect oiling setup, valve seals, valve guides, etc) that lead to oil down through the valves and a decent number of them are fixable without a full teardown.
With that many miles on a 250, if it has not beem rebuilt before then it is probably due. Worth doing some checking first though. | | |
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