B20B/2 Block,Balanced Crank,Block Girdle,Oil Cooler 84.5mm/85mm Bore,Endyne Pistons, 12.5:1 Compresion Ratio,Eagle Rods, Endyne Oil Pump,Endyne Catch Can Breather,ARP Head Studs,B18C Head. (I called them up seeing if it wuz a used b20 block, as it turned out, its a new block fronm DART...