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The ACL Race Series main bearing set for GM LS Gen III/IV offers a standard-size bearing with an extra .025mm / 0.001" oil clearance while retaining standard crankshaft journal diameter. It includes the 120-degree oil groove to support lubrication needs and provides a direct-fit option for rebuilds that require a slightly increased oil clearance without altering journal sizing.
ACL Chevy V8 LS Gen III/IV Standard Size Main Bearing Set
