I found this in the Hemmings motor news site:
Most Powerful Brass Era Car, pre-1916
1907-1908 Apperson Big Dick, 96hpFor those with $15,000 to spend, Apperson would put their race engine in a 50hp Jackrabbit runabout to create the Big Dick. A 96hp racing runabout, the Big Dick actually had the highest advertised horsepower in an American automobile through 1914. It had open exhaust and a 6 1/4-inch bore and 5 1/2-inch stroke, for 675-cu.in. Amazingly, the company sold 15 of them, and that in the face of competition from Locomobile's own $15,000 short stroke 990.1-cu.in., 90hp Cup Racer (the factory claimed 120hp for the 1906 Vanderbilt Cup car upon which it was based).