Briggs 5hp Flathead Stock Class Racing Engine | Valve Spring Backface Cutter .825

• Backface Cutter / Stock Class Valve Spring Pocket Cut.
• Includes .825 Stock spring cutter and .247 pilot shaft. Cutter uses a "D" lock design so shaft can be insert in through valve guide and cutter is installed inside breather box. See Photos of Cut-Away
• Machining valve spring pocket, increases total upward travel of valve (to touch cylinder head) and changes valve spring pressure needed to set-up valve float. Eliminates spring from moving and touching valve stem.