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Old 10-15-2008, 08:49 PM's Avatar is offline
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I have seen quite a few of the later one piece rear seal blocks stress crack above the lifter bores. Usually toward the rear and up a couple inches. Running at an angle across the surface.

I have drilled the ends of the cracks, V-eed these cracks out, heated the block to about 500 degrees and welded the blocks. But, this is not something most shops can do. Also a bit spendy if you have a blacksmith do it.

Another block would be cheaper, unless you really need the matching numbers
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