* Multiple Engine Options: International Harvester offered a variety of engine options in the FleetStar line for that year. They included:
* IH Diesel Engines: Various models of the International DT series, which were typically powerful but fuel-thirsty.
* Gasoline Engines: The FleetStar could have come with gasoline engines, though less common for heavy-duty trucks.
* Other Engine Manufacturers: It's even possible some models had engines from other manufacturers like Cummins or Detroit Diesel.
To determine the specific engine in your 1974 FleetStar, you need to:
1. Check the VIN (Vehicle Identification Number): The VIN will tell you the model and year, and often includes a code that indicates the engine.
2. Look for the Engine ID Plate: There should be a plate on the engine itself that lists the engine type, serial number, and other relevant details.
3. Consult a Truck Identification Guide: Specialized guides exist that can help you decode the engine code based on your VIN.
4. Contact an International Harvester Dealer or Mechanic: They can help you identify the engine based on the truck's VIN or other information you have.
Let me know if you have any other information about your FleetStar, and I'll try to help you narrow down the engine possibilities.
