ACL Subaru/Scion FA20 Standard Size High Performance Rod Bearing Set

ACL 4B8310H-STD is a connecting-rod bearing set for the cataloged Subaru / Toyota FA20, FA24D, FA24F, 4U-GSE 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.

ACLs 2023 guide lists the 4B8310 rod-bearing family for FA20, FA24D and FA24F configurations. FB20/FB25 engines use the separate 4B8325 rod-bearing family, even where the 5M8312 main-bearing family is shared. Confirm the exact engine and rod-journal dimensions.

Engine Application

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 rod-bearing set contents and shell positions 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 4B8310H-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.

Related Engine Parts

ACL 5M8312H-STD main bearings. This separate component uses its own measured main-journal clearance; confirm the exact engine configuration and size before pairing parts.