sentences:  Inline models included one, two, three, four and six cylinders, and the V-types six, eight, 12, 16 and 24 cylinders.The two largest V units used multiple cylinder heads per bank to keep the head size and weight to manageable proportions, the V-16 using four heads from the four-cylinder inline model and the V-24 using four heads from the inline six-cylinder model.This feature also assisted in keeping down the overall cost of these large engines by maintaining parts commonality with the smaller models.