1971 351 Cleveland, Oil In The Radiator

[Kathy Heald]

Need help where to go next.

We have Oil in the Radiator no water in the Oil. It's not overheating and it was running strong until last night, when it sputtered on the highway. Got home and the oil light came on. Oil is low was fine 2 days ago.
We have completed a head gasket replace, the heads were tested and polished 95% to 100%.
Original radiator
Carb is a 2 barrel autolite. We were going to replace the 2 barrel with a 4 barrel performance 600CFM Edelbrock with an Edelbrock aluminum intake. I've heard that replacing the intake manafold will solve the oil in antifreeze issue. Is this correct?? Thanks for your help.

 

[Davedacarpainter]

Need help where to go next.

We have Oil in the Radiator no water in the Oil. It's not overheating and it was running strong until last night, when it sputtered on the highway. Got home and the oil light came on. Oil is low was fine 2 days ago.
We have completed a head gasket replace, the heads were tested and polished 95% to 100%.
Original radiator
Carb is a 2 barrel autolite. We were going to replace the 2 barrel with a 4 barrel performance 600CFM Edelbrock with an Edelbrock aluminum intake. I've heard that replacing the intake manafold will solve the oil in antifreeze issue. Is this correct?? Thanks for your help.

Can't tell you for sure, post in the tech section of the subforum for your model, someone will be able to help out there. Good luck.

 

[horse sence]

I moved you over to Classic Talk ,Welcome to Stangnet .

 

[horse sence]

What heads are you running and what intake gasket set was used , If you used the gaskets for the later 5.0 ,they do not work with the early heads and will leak into the block .

 

[Kathy Heald]

Everything was already in place. We do not know what was in there. We are going to go ahead and put an Eddlebrock intake and a 4 barrel Eddlebrock Carb. The shop says these are made for the 351 Cleveland for the 71 mustang (grande). So if I understand correctly. The oil in the radiator could be a cause of having the wrong seals to begin with?

 

[RacerJames]

Not knowing what you have is the primary problem. There could be any number of issues.
Such as, the oil could be transmission fluid from the trans cooler, if it's an automatic, or, there is a crack in the block, or, the head gaskets were installed backward (That would cause overheating) or, the machine shop missed a crack in the head, or, when the porting was done they cut into the water jacket in the head, or, when the heads were replaced oil was spilled into the cooling passages in the block, and the engine wasn't properly filled (thus the low oil), or, any number of other weird things might have happened to this nearly 50 year old car.
If I had the symptoms you describe, and if the car has an automatic trans, I'd bypass the trans cooler in the radiator with an external unit. if that 50-70 dollar fix didn't help, then I'd be taking the engine out, tearing it down, and having it magnafluxed and sonic checked for cracks.

 

[Kathy Heald]

Thank you very much. I will let you know how it works out. Its my 17 year olds dream car. She is heart broken of the thought of a crack.

 

[RacerJames]

One thing is certain, it won't depreciate, and if you do have to take it apart, She'll learn a LOT