Pontiac 455 4340 Forged Steel Crankshaft ST-4.25 M-3.25 RJ-2.200 RMS-2Pc Ext Speedmaster Cam Lock Plate helps

Speedmaster Cam Lock Plate helps prevent cam bolts from backing out

and increasing the cap's resistance to closing up under high loads

Ideally suited for use with Solid / Mechanical flat tappet and Hydraulic Roller Cams

Fits big block Chevy rectangular port cylinder heads on standard deck blocks

Four corner water ports

Pontiac 455 4340 Forged Steel Crankshaft ST-4.25 M-3.25 RJ-2.200 RMS-2Pc Ext Speedmaster Cam Lock Plate helpsThese Speedmaster crankshafts are made from the same strong aircraft quality forging as standard weight cranks, but have profiled counterweights for less weight. Speedmaster lightweight crankshafts are perfect for engines wanting quicker rpm. These crankshafts feature profiled aero wing counterweights and have straight shot and chamfered oil holes. Speedmaster crankshafts are nitride hardened, with large radii on all journals for superior wear