99345hp

I want to hear everyones idea on how antifreeze can just run into the oil pan on an LS7 engine.

Brand new crate engine. Engine has been run for maybe 15 seconds total. With 6 quarts total in the motor. Upon start up oil overflowed the breather tank. Took the drainplug out of the motor and about a gallon and a half of anitfreeze came out before oil.

Anyone have any ideas?

typhoon1110

head gasket pinched? cracked head/block? shipping damage?

99345hp

Thats all I could think of. Didn't know if there was some stupid thing I could have missed or some secret about the LS7 I didn't know.

Outlaw1

iTrader: (14)

Are you Running Dry Sump or Wet Sump setup?


Sounds Like you added Coolant to your Dry-sump Reservoir.

GMCHammer

iTrader: (4)

Do you have oil in your cooling system?

99345hp

its dry sump and I definately didn't add coolant to the dry sump resevoir. I am using petterson fluid system tanks for the oil and the coolant tank is 5 ft away from it.

Dont know if there is oil in the cooling system. Im not with the car right now so I cant check. The coolant is entering the oil so fast I dont think there is a way for oil to get into the cooling system.

the_merv

iTrader: (88)

Possibly a crack in the bottom of a Cylinder or a Cylinder Wall..

I would see if the Coolant gets into the Oil with the Engine off and just sitting in the Car.

I'm wondering as well..

99345hp

I guess I will try to firgure this out tomorrow. I could only think of something major causing this. Cracked block or something with a head gasket is all I could think of.

KCS

iTrader: (20)

Take a look at the sleeves. Pull the heads and measure to see if the sleeves are flush or not. Look at the head gaskets and see if you can tell where water may have seeped through.

99345hp

Ill have to figure something out. Any motor work in this car is going to be a major PITA!!! I cant believe this happend with a brand new crate engine.

99345hp

Found out what it was. Another shop had this engine before us, and they had installed a cam and machined the heads to accept bigger valve springs. When they machined the heads they hit a coolant passage, which filled up the crankcase with coolant.

jay_lt4

iTrader: (4)

so it wasnt a brand new crate engine from gm?

99345hp

well we thought it was. We just found out today that someone had opened it up. Too many hands have been on this car.