I believe this to be a 7.3 International engine. This unit was running at the time of removal from a school bus which was used for storage. The engine hasn't run for years. The transmission is a Clark 5 speed, known for long service life. A school bus wouldn't have stressed this drive train much at all. My asking price is low enough you can't lose on this. Call me at 7-eight-5 657, triple zero 7, anytime. Thanks for looking.