C10 Pickup / C20 Pickup / C30 Pickup / K20 Pickup / K30 Pickup 5.0L 1971, Crankshaft Main Bearing Set (BC296J020) by Enginetech. The Engine Builders Source, can locate the right part for nearly any rebuild application. Offering a full line of internal engine parts for domestic, import and high performance applications, Enginetech products are manufactured only in high quality facilities with ISO, QS & TS quality systems in place. Developed to ensure excellent performance, this product is made in accordance with the most stringent standards to meet or exceed your expectations.