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No problem boring the 41 block to 3 3/16, after you remove the sleeves that's only another .040" This will however creat a small lip that will prevent the installation of rings I use a special cutter in the boring bar to remove it. OR you can bore to 3 3/15 +.030 ant this will remove the ridge.. OR you can sonic test the block and bore to 3 5/16.