Rare hard to find Genuine New Old Stock Ferguson (Continental Engine) kit to convert exhaust valves to Rorating Exhaust Valves.  Kit includes 4 New Valves, 4 Valve Rotator Caps, 8 Valve stem Locks and installation instructions.  Converts original non-rotating exhaust valves to Rotating Exhaust Valves.  Same exhaust valve rotators as used on TO-30, 35, F-40 and later models.