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Repairing a 53 Block

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Every thing I have read and seen on the lock and stitch method is very spotty with few long term positive results on the blocks. Most have developed a leak again even after the stitch. Problem being is that blocks still flex a bit and expand and contract so in short once its cracked I would not waste any time or money on it. I have seen articles on people who have looked inside the coolant passages of these blocks and found in pretty much every case that a small crack exposed on the outside it always a lot bigger inside the block what you see externally is just a fraction of the crack.Kind of like the pencil holder crack on the outside but on the inside you find:moon:

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