Re: Radiator Sludge

"The head gasket leaking? The overheating could be because the
engine is still not run in yet, but what's the brown sludge?"

Just a guess, but I'd say your head gasket is leaking, allowing engine oil 
into the coolant.  Is the sludge oily?

Good luck

John O'Brien
'61 bugeye
NEW to me '66 BJ8

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///  (If they are dupes, this trailer may also catch them.)