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Oil channels going up through the cylinders and head to the camshaft could get blocked by inappropriate use of sealant. With the exception of the two crankcase halves, sealant is generally not necessary or desirable.
 

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Discussion Starter · #3 · (Edited)
Ok, I'm gonna have a look at that when I take it a part. I think I just found some great pictures from LDR's 1979 engine.
 

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If someone used sealer on the base gasket it's quite possible to block oil flow to the head/cam. Other than that I don't think there's any real issue of passage blocking.
 

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Discussion Starter · #5 · (Edited)
If someone used sealer on the base gasket it's quite possible to block oil flow to the head/cam. Other than that I don't think there's any real issue of passage blocking.
I flushed out thin flanes when I changed the engine oil (black paper thin & flat pieces. Probably soft and maybe soot) ..I wonder if it's enough to block any passages, PO had no spring under the oil filter. The second time I changed the motor oil it was "clean". I guess the black stuff doesn't block any passage
 
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