engines...?
That year model had either or, depending on what time of the year it was manafactured. You can look on the engine, either stamped on the casing over the pto or the mag side and get the EIN numbers off it. There may be an X in the numbers, but if not, you can call, 1.877.330.0231 toll free. If you have the EIN number, year, make and model, they'll be able to tell you if it's the X series or the standard 657. That number is a suppier of remanafactured OEM engines.
Good luck.................:cheers: