ACL Ford 4 2.0L Duratec Standard Size Race Series Rod Bearing Set

ACL 4B4390H-STD is a connecting-rod bearing set for the cataloged Ford / Mazda Duratec 20, LF MZR 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 Mazda MZR guide lists this rod-bearing family for the 2.0L LF engine. The 2.3L L3 and L3-VDT applications use separately cataloged rod families even where 5M8174 mains are shared. Confirm the exact engine and rod-journal measurements.

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 4B4390H-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 5M8174H-STD main bearings. This separate component uses its own measured main-journal clearance; confirm the exact engine configuration and size before pairing parts.