ACL Bearings Race Series Main Bearing Set - Standard - Extra Oil Clearance - Coated - GM LS-Series 25031 O2 bung locations optimized for

O2 bung locations optimized for wide-band O2 sensor operation/reliability

Borg & Beck and Mark XII style clutches

Stock external dimensions and hose locations

Weatherproof cover and terminals

finishing and packaging/warehousing facilities in Santa Paula and Ventura

ACL Bearings Race Series Main Bearing Set - Standard - Extra Oil Clearance - Coated - GM LS-Series 25031 O2 bung locations optimized forProduct Description: Main Bearing Race Series Standard Extra Oil Clearance Coated GM LS Series High performance driving demands that you use the best parts. So rely on ACL's Race Series Products to perform to the exacting race standards you expect. They provide the dependability it takes to hold up under higher RPM conditions. The unique combination of design, metallurgy and engineering come together to deliver what drivers expect from high