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When using screw-in Studs on a factory cylinder head it is necessary to machine down the Stud boss equal to the thickness of the new Stud's jam nut plus the guide plate thickness. The Stud Boss Cutter from COMP Cams comes with a universal arbor that also acts as a pilot/guide and fits into the original Stud hole.
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Paying for expedited shipping methods only affects the time frame once the package is in the hands of the carrier. Paying for these methods does not and can not affect actual product availability or turn around times.
