ACL Race Series Dual Thrust Main Bearing & Big End Bearing Set

In the ACL Race Series, the unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high performance Tri-metal engine bearings. Designed to withstand higher RPM conditions, ACL Race Series Engine Bearings are extremely well respected amongst Subaru Engine builders. High strength overlay plate with reduced thickness for improved fatigue properties Hardened steel backs on all rod bearings to improve the support of the bearing and assist with bearing retention in the housing Increased crush for improved bearing retention Elimination of flash plating on the back of the bearings to improve heat transfer through the bearings and to maximise the grip between bearings and its housing Increased eccentricity to compensate for bore distortion at high rpm and to assist in the formation of hydrodynamic oil films 3/4 grooved Main Bearings to optimise load carrying surface area and oil flow to the conrod bearings Tight consistent wall tolerance to help maintain consistent clearances Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts. This kit is to be used with Subaru EJ block cases that have been converted from middle thrust position 3 to rear thrust position 5. In this instance, both types of main thrust bearing must be used. Please make contact with RCM if you are unsure.