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Got A Leak...and It's A Slow One.


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What is the most likely cause of the cracking? Excessive heat/egts?

No, the place the block cracks is down lower on the side. There is no cause that you can point to and say with all certainty "That's IT!". Speculation is the casting was reduced there as a cost saving measure or defect, or the way the engine mounts are on the truck contribute to the cracking. The worst blocks are the "53" blocks and obviously some of the "55" blocks.

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