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 Acura/Honda K20A2/K24A Standard Size High Performance w/ Extra Oil Clearance Rod Bearing Set

$ 88.82
$ 88.82

ACL 4B1972HX-STD is a connecting-rod bearing set for the cataloged Honda K20A2, K20C1, K20Z1, K24A1 engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.

Bearing Configuration

HX specifies 0.001 inch (0.025 mm) additional oil clearance relative to the corresponding H-STD set on the specified standard-size shaft. It is separate from any repair-size or housing-oversize designation.

Engine Application

Manufacturer / Engine Honda — K20A2
Manufacturer / Engine Honda — K20C1
Manufacturer / Engine Honda — K20Z1
Manufacturer / Engine Honda — K24A1
Manufacturer / Engine Honda — K24A3
Manufacturer / Engine Honda — K24A4
Manufacturer / Engine Honda — K24A8
Manufacturer / Engine Honda — K24Z1

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 4B1972HX-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) 51.004–51.024 mm
Catalog Rod Journal Diameter (STD) 47.980–48.000 mm
Catalog Family ACL Race Series
Half Type Identical halves
Catalog Size Options STD

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 4B1972HX-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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