I just ordered a Mackissic (Johnson) Big Wheel push mower (24-inch cut, 20-inch wheels. BBC). It comes with an Intek I/C 6.5HP horizontal engine. A similar 24-inch walk-behind, the Billy Goat Countour, comes with a 6.5HP "Intek Pro I/C" engine. Briggs doesn't list such an engine. Nearly all Google hits turn up the Billy Goat. I tried "Intek I/C Pro" and got a few hits, mostly for generator engines. Can anyone tell me what distinguishes the Intek I/C from the Intek I/C Pro?