Oil in the radiator

[gordie4659]

Question: I have oil in my radiator (looks like chocolate milk) but no water in my engne oil pan. Tranny fluid is fine. I'm thinking perhaps a blown head gasket but my F250 runs fine and is not overheating and oil pressure is OK. This 390 was just rebuilt along with the c6.Perhaps there is a crack between the oil galley and the water jacket? I did have to add a bit of oil.

I had just put the c6 back in and took it out to the freeway to give her a run. Everything is good and was pushing it up to 70mph and the engine bogged down. It felt like I had some trash plugging the fuel line. I slowed down and it was fine once I brought it down to 60mph it ran fine. This engine was broke in (it has 1000 miles on the rebuilt engine. Any ideas guys? I want to try to get ideas on diagnosing the problem before I tear the engine down. Thanks

[Ranchero50]

Flush the bejesus out of the cooling system and let it run with straight water for a week or two. Per the bogging, need to describe it better and try some stuff when it does it to help diagnose what it's doing.

[tnlprt]

Cascade dish soap to flush the cooling system...google will tell you how


Not uncommon for the oil feed galley to the heads to have a hairline crack

BUT clean the cooling system first before jumping to conclusions