Head specifically removed from a throttle governed 3Hp Fairbanks Morse Z spark plug engine. This head has a freeze crack and will need repaired before being installed! Valves are loose and move freely, for best results a quick lapping and clean job would probably be a good idea! Original part number ZBA5. The 4 head mounting holes are spaced 4 1/4 apart from each other on centers. The carburetor mounting holes are 3 3/16 apart on centers. Keep in mind this item is old and used and will require some work before being able to be put to work! Please see pictures for the absolute best description!