Made of 3/4” Billet 6061-T6 aluminum, the D.S.S. 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. Our Main Support System makes it possible to produce 650-plus horsepower from a production block.