ACL Bearings 5M909H-20 H-Series Main Bearing Set for Small Block Chevy, 0.020-Inch Undersize

The ACL Bearings 5M909H-20 H-Series Main Bearing Set is designed for small block Chevrolet engine applications requiring main bearings with a 0.020-inch undersize specification. This matched bearing kit supports precise crankshaft fitment and is suited for performance-oriented engine builds, rebuilds, and replacement applications where dependable main bearing function is essential.
The H-Series design is engineered to provide reliable bearing support under demanding operating conditions. Each bearing shell is manufactured to help maintain consistent oil control, reduce friction, and promote proper crankshaft alignment when installed with compatible engine components. The 0.020-inch undersize specification is intended for crankshafts machined to the corresponding journal size, so professional measurement and verification are recommended before installation.
This ACL Bearings main bearing set is supplied as a complete kit for the applicable small block Chevy engine configuration. Use the part number 5M909H-20 to confirm compatibility with the engine block, crankshaft journal dimensions, oiling requirements, and intended performance level. Proper cleaning, clearancing, lubrication, and installation procedures are necessary for dependable service life.
The ACL Bearings 5M909H-20 main bearing set is not air restricted and does not require truck freight shipping. It offers a practical replacement solution for engine builders and automotive professionals seeking a purpose-built H-Series main bearing set for small block Chevrolet applications.

Features:

• Brand: ACL Bearings

• Part Number: 5M909H-20

• Bearing Type: H-Series main bearing set

• Application: Small block Chevrolet engines

• Fitment: 0.020-inch undersize for properly machined crankshaft journals

• Quantity: Complete main bearing kit

• Use: Engine rebuild, replacement, and performance applications

• Shipping Classification: Not air restricted and not truck freight only