The T4 outboard debuted in 1979 on Mercury Factory Team tunnel boats raced by Billy Seebold and Earl Bentz in the Formula 1/OZ unlimited class. In practice Bentz shattered the previous 1.76-mile lap record of 86.78 mph with a lap at 98.24 mph. The motors raced by Seebold and Bentz were prototypes and kept under wraps at all times at the races. The production version of the electronic fuel injected, 74-degree V6 T4 model was offered for sale to qualified racers through the mid-1980s. https://www.