ACL 4B2322H-STD Race Rod Bearing Set Standard Opel GM Family II C20XE Z20LET 2.0

Vehicle Fitment

• Opel/Vauxhall Astra (F/G/H) - 1.8L, 2.0L (C18NE, X18XE, C20NE, C20XE, X20XEV, Z20LET, Z20LEH, Z20LER, Z20LEL and related)
• Opel/Vauxhall Vectra (A/B/C) - 1.8L, 2.0L, 2.2L (C18NZ, C20NE, X20XEV, C20LET, X22XE, Y22SE, Z22XE and related)
• Opel/Vauxhall Calibra - 2.0L (C20XE, C20LET, X20XEV)
• Opel/Vauxhall Omega (A/B) - 1.8L, 2.0L (C18NZ, 18N, 20SE, C20NE, X20XEV and related)
• Opel/Vauxhall Zafira (A/B) - 2.0L (Z20LET, Z20LEH, Z20LER)
• Opel Kadett - 1.8L, 2.0L (C18NT, 18S, 20XE, 20SER)
• Opel Frontera - 2.0L, 2.2L (X20SE, X22XE, Y22SE)
• Holden Camtech / Ecotec variants (Australia)
• GM do Brasil Chevrolet Astra / Vectra - 1.8L, 2.0L, 2.2L, 2.4L Family II variants

Fitment Notes

• Standard (STD) crankshaft rod journal diameter - for use with stock or unworn crankpins at factory diameter only. For reground crankshafts, use 4B2322H-.025 (+0.025mm), 4B2322H-.25 (+0.25mm), or 4B2322H-.50 (+0.50mm) as appropriate.
• An HX extra-clearance variant (4B2322HX-STD) is also available for builders targeting approximately 0.025mm (0.001") additional running clearance at standard journal diameter without crankshaft grinding.
• Covers the full GM/Opel/Holden Family II engine family across 1.6L, 1.8L, 2.0L, 2.2L, and 2.4L displacements - all share the same crankpin journal dimensions.
• Always measure crankshaft rod journal diameter with a micrometer before selecting bearing size. Confirm actual clearance with Plastigage or a dial bore gauge after assembly.
• Sold as a complete set of 8 bearing shells - sufficient for one full 4-cylinder engine build.

Features

• Tri-metal construction: copper-lead alloy lining bonded over a hardened steel backing, with a high-strength overlay plate - engineered for the high-RPM and forced-induction demands of built Family II engines, particularly the turbocharged C20LET, Z20LET, and Z20LEH variants.
• Hardened steel backing on all rod bearings improves structural support of the bearing lining and maintains crush under high sustained loads and temperatures.
• High-strength overlay plate with reduced thickness provides improved fatigue resistance compared to OEM-spec bearings - critical in boosted Opel builds at elevated power levels.
• Increased bearing crush and tighter wall tolerances ensure consistent, secure seating in the connecting rod housing bore, reducing the risk of bearing spin.
• Enlarged ID chamfers on bearing edges accommodate the larger fillet radii found on performance and aftermarket Family II crankshafts.
• 3/4-groove design optimizes oil supply to the rod journal and maximizes load-carrying surface area across the bearing face.
• Elimination of flash plating on bearing backs improves heat transfer and maximizes grip between the bearing shell and rod housing bore.
• Increased eccentricity compensates for bore distortion at high RPM and assists in the formation of a stable hydrodynamic oil film under load.

Specifications

• Part Number: 4B2322H-STD
• Product Line: ACL Race Series
• Application: Connecting Rod Bearings
• Engine Compatibility: GM/Opel/Holden/Vauxhall Family II - 1.6L (1598cc), 1.8L (1796cc), 2.0L (1998cc incl. Turbo), 2.2L (2198cc), 2.4L Inline-4
• Key Engine Codes: C20XE, C20LET, Z20LET, Z20LEH, Z20LER, Z20LEL, X20XEV, X22XE, Y22SE, Z22XE, and all related Family II variants
• Crankshaft Size: Standard (STD - Unground)
• Shaft (Crankpin) Diameter: 48.971-48.987mm (1.9280-1.9287 in)
• Tunnel (Housing Bore): 52.000-52.012mm (2.0472-2.0477 in)
• Maximum Wall Thickness at Crown: 1.498mm (0.0590 in)
• Maximum Overall Length: 19.3mm (0.760 in)
• Bearing Material: Tri-Metal Copper-Lead Alloy / Hardened Steel Backing
• Quantity: Set of 8 Shells (complete engine set)

Included Components

• 8x Race Series Connecting Rod Bearing Shells - Standard Size

Product Description

The ACL Race Series 4B2322H-STD connecting rod bearing set is the standard-size performance replacement for the GM/Opel/Holden/Vauxhall Family II inline-4 engine family - one of the most widely used European four-cylinder platforms, covering 1.6L through 2.4L displacements across the Astra, Vectra, Calibra, Omega, Zafira, Kadett, and many related models from the 1980s through the 2000s. Designed for use with stock-diameter, unground crankshaft rod journals, this is the standard selection for fresh engine builds using a serviceable factory crankshaft confirmed to be within standard dimensional tolerance.

The Family II is particularly revered in the European performance community through the naturally aspirated C20XE (Lotus-developed 16v "RedTop"), the turbocharged C20LET (Calibra Turbo), and the later high-output Z20LET/LEH Ecotec variants - all of which share the same crankpin journal dimensions as the broader Family II range. ACL Race Series bearings deliver superior fatigue resistance, bearing retention, and oil film stability over OEM shells across all these applications. For builders targeting increased running clearance at standard journal size, the HX variant (4B2322HX-STD) is available separately. Always confirm clearances at assembly. Sold as a complete set of 8 shells for one engine.