Oil leaks into #1 is a head gasket failure for the most part -- later
heads and later gaskets have a better oil passage there (it's the one
going to the cam, I think). Very common failure point, and warpage
could make the head fail to seal there without any cracks.
The cracks that cause all the trouble are in the combustion chamber
and extend to the cooling passages, are hard to find, and impossible
to repair -- I suspect because they propagate too far to weld up and
probably welding just causes more to form adjacent. No one has
repaired on that I know of.
Peter
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