How many of you knew that Cummins built horizontal versions of its big truck engine, called the NHH, the extra H for horizontal. Lay the engine on its side and tuck it under the floor between the axles, and you free up the whole front of the vehicle. Gillig school buses ran them for years, first the NHH220 a 743 cubic inch making 220 horsepower, then the NHH335 an 855 c.i. with up to 335 horsepower, the biggest engine ever put in a school bus. Peterbilt even used one in that crazy Model 451 cabover built for Ringsby. Same old Cummins we all know, just lying down on the job. 😂🚛 Sorry, couldnt get a better picture.