Al 6061 T6 possesses the similar chemical & mechanical properties as Al 6061 T651. T651 designates that the extrusion has to undergo stretching or permanent set to relieve the extrusion from residual stresses for a uniform machinability. Apart from that, there is no change in the chemical or mechanical properties. Al 6061 T6 is same as Al 6061 T651 & usage of T6 instead of T651 will not affect any functional aspect of the component.
6061-t651 = 5410
The aces of the staff during that timewere Whitey Ford and Ralph Terry. Other pitchers during that time frame were Art Ditmar, Bob Turley, Jim Coates, Bobby Shantz, Luis Arroyo, Bill Stafford, Rollie Sheldon, Jim Bouton, Marshall Bridges, Al Downing, Steve Hamilton, Hal Reniff, and Stan Williams, to name a few.