Enginetech Part Number: 125300 Crankshaft Kit With Bearings Fits 85-95 GM/Chevrolet 4.3L 262 V6 OHV 12V VIN 'B,N,W,X,Z' - 4.000in Bore Forging Numbers: 480, 640, 865, 5480, 5865, 8640, 10055480, 10105865, 4088640 Does not replace Forging Number 255 Has no balance hole drilled by #1 rod journal. Heavy Crankshaft to be used with early heavy pistons.? Except Balance Shaft Engines