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Old 07-13-2010, 08:24 PM
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could valve be stuck open

I just rebuilt topend on 86 Chevy half ton pickup 305 I changed valve seals I got it put back togather and started it up an now it smokes really bad got oil driping out exaust could I not could I not have rocker ARMs set right causing a exuast valve to stay open

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Old 07-13-2010, 10:58 PM
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This happens everytime you do a valve job on a block that has many miles. By getting the valves to seal causes the rings to "give up the fight". With better vacuum because the heads do not leak the rings allow oil to get "sucked" up into the combustion chambers and what you get is a smoker.


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Old 07-14-2010, 04:33 PM
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If the exhaust valve was hanging open, you'd have a "miss" symptom. Not only that, but if you adjusted the valves all the same way, then all the exhaust valves would be hung open. Then you'd definately know something was wrong. scholman pretty much nailed the cause.
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Old 07-14-2010, 08:06 PM
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It could also be valve guide seals, worn guides, broken ring.
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