ACL Chevrolet Small-Block V8 Main Bearing Set 5M909H-STD

ACL 5M909H-STD is a main bearing set for the cataloged Chevrolet 262 V8, 265ci L99, 267, 302ci Large Pin 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 lists 5M909 mains for the cataloged conventional large-pin small-block application group. The 400 ci small block uses the separately cataloged 5M1038 main family, while Gen III/IV LS applications use 5M7298 or 5M7299 mains. Select by the exact block and crankshaft configuration rather than assuming all Chevrolet small-block mains interchange.

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 5M909H-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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