"Mechanics Special" Indirect injection, 34 HP@2600 rpm, Bore/ Stroke: 3.23x3.23 inch.Test ran 9-13-16: Runs ok with 40+ psi oil pressure (See it run on video). Engine sat for a period of time and smokes. May clean up with more run time or may need piston rings. Injection pump was gummed up and may need some TLC. Selling as is. Engine does not come with Flywheel, bell house or starter.