1930 Plymouth Image Gallery and Blog The four doors 1930 Plymouth is the royal and luxurious vehicle which has its own standards. It was the turning point for the alternate horn allocation. It was in this vehicle that the location was horn was changed to be in the center in between the headlights. The white rim wheels add to the beauty of wire wheels and the arrangement of the same. It measures up to 196 cubic inches with 48 hp engine.