Sludge in coolant, high pressure

[slikside]

A quick way to determine if you have coolant in your oil, although this will be harder with your intake and a head removed...

Run the engine until it's at temp, and the exhaust manifolds are HOT.

Pull the dipstick and let a few drops of oil land on the exhaust manifold. If you only have oil there, it will just sit and smoke, but if there's water/coolant in the oil, it will sizzle and boil til the liquid is evaporated.

It's truly amazing what you can remember from high school auto shop some 40+ years ago. Just don't ask me about day before yesterday!LOL!