Multi-angle valve jobs are used to ease the flow transition from the port to the chamber on the intake side and from the chamber to the port on the exhaust side. The width, number and concentricity of these cuts influence sealing effectiveness and flow quality.
Tennys Sandgren is an American professional tennis player competing mainly on the ATP Challenger Tour both in singles and doubles. Born and raised in Gallatin, Tennessee, he went on to play two years of college tennis at the University of Tennessee before launching his professional career.
On this day in 1957, Althea Gibson defeats Darlene Hard 6-3, 6-2 to become the first black player ever to win Wimbledon. Gibson was born in South Carolina on August 25, 1927, and raised in Harlem. She started playing tennis in 1942 at the Cosmopolitan Tennis Club under the tutelage of...