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Compare the wedge head gasket (top) with the Hemi head gasket (finger points) and you can see where the wedge block is rounded off versus the square deck ends found on Hemi blocks. This is where oil-drain-back holes are found on Hemis. The Hemi Conversion heads are cast without drain-back passages and use external drain hoses instead. The center row of head-bolt holes in the block must be up-sized from 7/16 to 1/2 inch for better gasket clamp and compatibility with the Stage V rocker-shaft stands.