2. The total maximum piston displacement of the engine or any number of engines installed in a boat of this class shall not exceed 7 Litres (427.161 cubic inches.)

3. Competing boats shall be powered with one internal combustion motor of the 4 cycle type, either supercharged or unsupercharged. Providing the cost of said engine or any number of said engines installed in boat of this class does not exceed $2,000 for unsupercharged engines, or $2,500 for supercharged engines. These prices shall be based on respective manufacturers current list market price for engines, parts and conversions including such equipment as starter, fuel pump, ignition systems, carburetor, etc., but does not include such equipment as battery, propeller, tachometer, gages, instruments, exhaust piping, tanks, etc.

4. The overall dimensions of the hull for the 7 Litre class excluding projections will be a minimum of 19 feet and must be propelled by an underwater screw type propeller.

5. Championships in this class shall be awarded as follows:  Divisional, National and World Championships.

6. The use of superchargers shall be permitted.

7. The letter prefix to the racing number for this class shall be "H"