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Old 10-05-2017, 12:16 PM   #2
geezer#99
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Join Date: Aug 2009
Location: Bowser
Posts: 13,494
Re: Cylinder head carbon forrest

That sludge is created from lack of a good pcv and long run times.
While you might get a valve stuck problem, I'd be more concerned about any of that stuff you disturb getting into the oil and on into your bearings.
I've had them like that. Best is to tear it down and totally clean it out. But then you're pulling the motor and partly rebuilding it.
I prefer to use a shop vac and slowly vacuum it up.
Some shop towels will finish the cleaning process under the valve covers.
Then you gotta look inside the lifter valley. It could be worse than under the covers.
Some people use diesel to wash it out but then you never know where all those fine products get to.
On a high mileage motor I'd clean it with the vac and just motor on.
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