Size Chart
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ACL 4B1906H-STD is a connecting-rod bearing set for the cataloged Honda F23A1, F23A4, F23A5, F23A7 engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.
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 the 4B1906 rod family for K20A3 and for 1998-on F23A/F23Z. Their main-bearing families differ: K20A3 uses 5M1959, while the listed F23A/F23Z applications use 5M1957. Select the main and rod bearing locations independently by exact engine code and measured clearance.
| Manufacturer / Engine | Honda — F23A1 |
|---|---|
| Manufacturer / Engine | Honda — F23A4 |
| Manufacturer / Engine | Honda — F23A5 |
| Manufacturer / Engine | Honda — F23A7 |
| Manufacturer / Engine | Honda — F23Z2 |
| Manufacturer / Engine | Honda — F23Z4 |
| Manufacturer / Engine | Honda — K20A3 |
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.
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 4B1906H-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) | 48.000–48.024 mm |
| Catalog Rod Journal Diameter (STD) | 44.976–45.000 mm |
| Catalog Family | ACL Race Series |
| Half Type | Identical halves |
| Catalog Size Options | STD, .025, .25, .50 |
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.
Is the year and model enough to choose this bearing? No. Match 4B1906H-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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