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On a 350 Chevy. I found two drivers side, back two spark plugs oil fouled but the other six are ok. thoughts?

Sep 11, 2007 by Jon K | Posted in Maintenance & Repairs

They are completely oil fouled but the other six are perfectlly fine. Bosch platinum plugs. Any suggestions on what is wrong? Maybe the valve guides are leaking on those two cylinders? Rings? Would be odd since the other 6 are just fine.

Could you see oil on the threads or higher? You may be leaking oil out of your valve cover gasket (or tube seals) down into the tubes. The oil can leak through the threads and then burn up upon ignition.
If it's not coming from above then it's

Allison R | Sep 11, 2007

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