ACL B-Series/ K-series-STD Main Bearing Set – ACTIVAOOO RACING
ACL B-Series/ K-series-STD Main Bearing Set

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ACL B-Series/ K-series-STD Main Bearing Set


  • $64.99

    • Overview
    • Specs
    • Fitment

    ACL engine bearings are recognized as a premier brand throughout the motorsports world. Race Series rod and main bearings are standard components in race engines that have set records and won championships from Mexico to Bonneville - from sport compact drift racing to small block NASCAR, IHRA, and NHRA cmpetitions. The unique combination of design, metallurgy, and engineering provides Race Series performance bearings with the endurance and capability to perform where others cannot. These exceptional bearings are available for a variety of American, Asian, and European performance engines.


    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 lining 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 maximize the grip between the 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 optimize bearing load carrying surface area and oil flow to the conrod bearings

    Tight consistent wall tolerances to help you maintain consistent clearances

    Enlarged ID chamfers on bearing edges where required to accommodate large fillet radius on performance crankshafts

    Part Number: 5M1959H-STD

    Min Shaft Size:2.1646"
    Max Shaft Size:2.1654"
    Min Tunnel Size:2.3228"
    Max Tunnel Size:2.3236"
    Max Wall Size:0.0788"
    Max Overall Length:0.787"
    Oil Clearance Size:Standard
    Half Type:Upper and Lower
    Bearing Thickness:Standard
    Part Number:5M1959H-STD
    AcuraB17A1/B18A1/B18B1 / B18C1/B18C5 VTEC

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