Oil in my radiator

Dartsun said

After initial engine and cam break in on my 66 273 hipo rebuild I noticed that there is oil in the radiator. Can this be caused by an intake leak or is it more likely a head gasket failure. It doesn't smoke but it did smoke for a few minutes out of the passenger side on initial break in. Thanks Dustin

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It's been a while back, but I had that happen to me twice, I think I only had the timing cover off both times. But I don't know what I did wrong either.
I drained the oil and put it in empty clear one gallon water jugs and checked it out. No antifreeze in the oil both times.
Added coolant and soaked the oil off the top of the radiator coolant with a rag.
Fired it up, no more oil in the coolant, and no problems. And the awful feeling of Panic was gone too.