SCAT's Pro Series Lightweight Crankshafts are manufactured from non-twist, single plane 4340 forgings. These crankshafts have straight shot and chamfered oil holes; large radii on all journals; lightening holes in all rod journals; aero wing counterweights. "RB" Block Wedge + HEMI Pro Series 4340 Forged Lightweight Crankshafts are precision ground, heat treated and nitrided for superior wear resistance.