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ACL connecting-rod bearing set — manufacturer catalog product photo
ACL engine bearing-shell profile drawing — shell shape and oil-hole layout
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ACL Toyota 4AGE/4AGZE (1.6L) Standard Size High Performance Rod Bearing Set

ACL
ACL4B1780H-STD
9315726154120
Bearings
Out of stock
$ 129.70

ACL 4B1780H-STD is a connecting-rod bearing set for the cataloged Toyota 4A-GE (20v), 4A-GE, 4A-GEC, 4A-GELC 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.

ACL’s 2023 guide lists this rod family for 4AGE, 4AGZE, 4A-GEC and 4A-GELC applications, with 5M1695 mains listed separately. The broader 5M1695 main-family coverage does not establish this rod set for every 2A/3A/4A/5A/6A/7A engine. Confirm the exact engine and rod-journal dimensions.

Engine Application

Manufacturer / Engine Toyota — 4A-GE (20v)
Manufacturer / Engine Toyota — 4A-GE
Manufacturer / Engine Toyota — 4A-GEC
Manufacturer / Engine Toyota — 4A-GELC
Manufacturer / Engine Toyota — 4A-GZE

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

Brand ACL
Manufacturer Part Number 4B1780H-STD
Component Connecting-Rod Bearing Set
Size Selection STD manufacturer size designation; verify the exact engine and assembled clearance.
Catalog Rod Housing Bore (STD journal) 45.000–45.024 mm
Catalog Rod Journal Diameter (STD) 41.985–42.000 mm
Catalog Family ACL Race Series
Half Type Identical halves
Catalog Size Options STD, .025, .25, .50

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 builder’s 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 4B1780H-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 5M1695H-STD main bearings. This separate component uses its own measured main-journal clearance; confirm the exact engine configuration and size before pairing parts.

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