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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