i had a cracked 53 with 100,000 miles and replaced with another 53 (long story) with 100,000 and no issues. THe turck is stock with no mods and is rarely driven.

Well, my truck has a 53 block, 256k miles and pushing just under 500 hp and 1200 ft lbs on the dyno and i have no crack, ive sled pulled, towed heavy farm equipment over 35k lbs, still no crack. My grandfathers truck is stock, 53 block, towed heavy campers and farm equipment on a very regular basis, no crack, 150k miles on his.

Keep in mind that less then 1 percent of all 53 blocks crack and only those blocks measuring .253 or less in block thickness at the freeze plug opening. Been around these things for years, only seen 1 "53" block crack out of dozens that ive seen.

there has been tons of write ups about this but TDR has the best one out there.

:rocking:

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heres more info, this isnt exactly a new topic

https://www.dieselbombers.com/24-val...-53-block.html

https://www.dieselbombers.com/24-val...formation.html

https://www.dieselbombers.com/24-val...53-blocks.html

We got a call on a motorhome with a cracked 53 block a few months ago. Freightliner wanted like $16k to fix it. They tried telling the customer that there was no way we could get a new block from Cummins and that the only answer was to replace the entire motor! Needless to say, I am pretty sure we will be doing that job here soon. . . .

i got a friend who just rolled 300k with a 53 block.

crappy 53 block definetly reblock is the answer

i had the same problem w/ a 99 and it cracked at 120k. I called cummins and they had me go to a cummins dealer and swapped my block. Like someone said above cummins picked up the parts and i had to pay labor and expendables. hope you get it worked out!