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Message: [QUOTE="Fast-6.0, post: 694251, member: 353"] To clarify some of the questions. The hard block is effectively sealing the oil and coolant apart from each other. If a block is cracked, then the hard block is also limiting the block from moving as much (which IMO will stop a crack from growing because the block is no longer flexing as much in that area). Also if cracked, then the crack will be be filled with hard block. My block is cracked and I have fixed it with BG cooling sealer, not using any coolant. Will it be an issue if I replace the heads? most likely but the point is, its not getting worse and my custom age studs are torqued at 250 ft-lbs. I discovered this too late (milky oil) which I know means my bearings are toast. For those that don't know, antifreeze eats engine bearings, so if you have milky oil, your bottom end is done. The blocks aren't cracking from power, they are cracking from the headstud torque. As far as cooling, if I were towing a 20K pound trailer, I wouldn't want a partially filled block, but that motor also doesn't need Custom Age head studs, nor a ton of the other stuff we install. The 7.3 radiator is weak compared to the 6.4 so that is a mute point IMO and Erik's has been flawless without any fan operation and its 90 degrees here. Any more questions? [/QUOTE]

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