King AMC / Jeep 390 & 401 (Undersize 0.30in) Crankshaft Main Bearing Set King Engine Bearings Sale! from 7599 /per Qty. Add to Cart This item is either made to order or has limited inventory. Please reach out to confirm lead times if needed. King AMC / Jeep 390 & 401 (Undersize 0.30in) Crankshaft Main Bearing Set