ACL Chevy LS Gen III/IV Race Series Main Bearing Set 5M7299H-STD

ACL 5M7299H-STD is a main bearing set for the cataloged Chevrolet / Holden / HSV 4.8L Gen III LR4, 4.8L Gen IV LY2, 5.3L Gen III, 5.7L Gen III LS1 engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.

Bearing Configuration

H identifies the ACL Race Series family. Match the complete suffix to the required clearance, shell width and locating features.

Engine Application

ACLs 2023 guide identifies 5M7298 as the 270-degree-groove main-bearing family and 5M7299 as the 120-degree-groove family for the listed Gen III/IV LS applications. This listing is the 120-degree configuration. Confirm the required groove arrangement and bearing positions; shared bore and journal dimensions do not establish that the two configurations are interchangeable.

The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.

Specifications

Quantity and Assembly Checks

Confirm the set contents, bearing positions and any separate thrust components against the complete manufacturer number. The photo is representative of the part family.

Measure shaft journals, housing bores and assembled oil clearance using the engine builders specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.

Frequently Asked Questions

Is the year and model enough to choose this bearing? No. Match 5M7299H-STD to the exact engine and measured build specification.

What size is this listing? STD manufacturer size designation; verify the exact engine and assembled clearance.

Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.

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