The ACL Race Series Performance STD Size Main Bearing Set (Product Code: 5M1957H-STD) is a high-quality crankshaft component designed for maximum performance and durability. Made from Race Series (Tri-Metal) material, each bearing in this set is fully grooved with one oil hole for optimal lubrication.

This set includes bearings for positions 1, 2, 3, 4, and 5, with a standard shaft diameter of 2.1646"/2.1654" (54.980mm/55.000mm) and a maximum wall of 0.0790" (2.007mm). The housing bore measures 2.3228"/2.3236" (59.000mm/59.020mm) with a maximum length of 0.7870" (20.000mm). The set also includes thrust washers (1T1957-STD) and is designed for engines with a STD shaft size of 55mm OD.

ACL Race Series bearings are known for their precision and performance. Manufactured in Launceston, Tasmania, Australia for over 70 years, ACL has been a leading OEM supplier to the automotive industry worldwide. Their extensive aftermarket product range is renowned for its robust metallurgy, quality, and innovation.

With a strong motorsport pedigree, ACL Race Series bearings have been used in Formula 1, Australian Supercars Championship, drag racing, speedway, drifting, and rally events. Engine builders trust ACL bearings for their reliability and performance.

ACL's ISO-certified Business Management Systems ensure the highest quality standards in manufacturing. The ACL Race Series Performance Engine Bearing range covers over 200 engine applications for various makes and models, with new releases continually being added to the lineup.

Upgrade your engine with the ACL Race Series Performance STD Size Main Bearing Set for superior performance and reliability. Trust ACL for precision engineering that delivers results on the track and the street.