Made of 3/4” Billet 6061-T6 aluminum, the D.S.S. 5.0 X BOSS Main Support System effectively dampens damaging harmonics, virtually eliminating main bearing walk. The Main Support Plate is fastened to the main caps using custom ARP main studs (included), effectively tying all five main caps together. By adding another main web structure you dramatically increase the block’s strength, helPing both block and crankshaft life. When added to the M-6010-BOSS302 and M-6010-B302BB Ford Racing block you have unparalleled strength and durability for your small block Ford.