Update I’m 90% positive it has a cracked block Weird question. Have you ever seen a 6.0 intake manifold crack internally causing coolant to get pressurized? Just did head gaskets. O ringed heads. Spent 3 days lapping the deck surface and got a very very solid finish on it. Heads were brand new. With o rings. Haven’t drove it. Just fired up. Warmed up and capped off the coolant. Held it around 2500 for a bit and then tested coolant pressure and it’s got quite a bit again. About the same it had be