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About the Van - 1976 GMC Motor Home
Technical Specifications
Dimensions:
                Track:     Front                    75.28 in
                              Rear                     85.12 in
         Wheelbase:    160 in
               Length:    26 ft. 9in.
  Front Overhang:     42in
   Rear Overhang:    89in
     Ceiling Height:    76in

Capacities:
        Fuel System:   Two 25 gallon tanks
   Cooling System:   21 quarts
           Engine Oil:   5 quarts
      Transmission:    4 quarts
          
Engine:
      Displacement:   455 Cubic inches (6.6 Liter V8)
             Fuel Req:   91 Octane or higher
 
Source: 1973 GMC Motorhome Owner's Manual