The ACL main bearing set includes guidance to use replacement 3M2977A-.25 when original stock is exhausted; it is identified as an engine crankshaft main bearing set for the applicable Toyota application. Use this set during engine overhaul to reestablish crankshaft support and running clearances, and refer to the alternate part number if the standard item is unavailable.
ACL WHEN STOCK EXHAUSTED USE 3M2977A-.25 Engine Crankshaft Main Bearing Set