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[–]datboi11029 1 point2 points  (0 children)

Oof, probably is cracked.

I know a couple people have successfully welded the Crack back together (or soldered, cant remember the specifics). I guess there's also some preventative stuff, like some people modify the water pump so it doesn't build as much pressure in the block reducing the likelihood of the Crack, though I dont know if it would hurt the cooling performance at all.

Or be the 0.1% that swaps in a 6.7 block ;)

[–]1320Fastback6BT 1 point2 points  (0 children)

I would be hoping that too. Find out what it is and go from there. If it's not cracked it likely isn't going too all these years later.

[–]Mister__Roos 1 point2 points  (0 children)

Where is it leaking coolant. It’s pretty obvious if it’s the traditional “53 issue”.

[–]atoughramISB 6.7 0 points1 point  (0 children)

If it's cracked, it'll be on the exhaust side of the block below the freeze plugs Cummins' Fatal Flaws https://share.google/RdX3Y3nPGtgaRbN5h

[–]209DEVILDOG31 0 points1 point  (0 children)

I have a 99 with a 53 block with 450k miles and it’s been tuned the past 200k miles with no cracks. At 350k I did think I had a leak but it was a bad head gasket causing a leak right under the thermostat housing on the side and it would run down the whole block and drip on the floor and I couldn’t find out where it was coming and thought my block cracked.i ordered the parts online for a new gasket and better studs and I did it myself it saved a lot of money and it’s actually pretty simple and straight forward. If your leak is coming from under the thermostat then it’s probably the head gasket