ACL 6B2390H-.025 Race Rod Bearing Set +0.025mm Nissan VG30 VG30DETT RB30 300ZX

Vehicle Fitment

• 1984-1996 Nissan 300ZX (Z31/Z32) - VG30E, VG30ET, VG30DE, VG30DETT (3.0L V6 NA / Twin Turbo)
• 1985-1994 Nissan Maxima - VG30E, VG30i (3.0L V6 SOHC)
• 1987-1988 Nissan 200SX - VG30ET (3.0L V6 Turbo)
• 1987-2000 Nissan Pathfinder - VG30E, VG30i, VG33E (3.0L/3.3L V6)
• 1990-1994 Nissan D21 Hardbody Pickup - VG30E, VG30i (3.0L V6)
• 1990-1992 Infiniti M30 - VG30DE (3.0L V6 DOHC)
• 1993-1997 Infiniti J30 - VG30DE (3.0L V6 DOHC)
• 1993-2002 Nissan Quest - VG30E, VG33E (3.0L/3.3L V6)
• 1997-2000 Infiniti QX4 - VG33E (3.3L V6)
• 1999-2004 Nissan Frontier - VG33E (3.3L V6)
• 2000-2004 Nissan Xterra - VG33E (3.3L V6)
• Australian Holden Commodore VL (1986-1988) - RB30E (3.0L Inline-6 SOHC)
• Various Nissan/Holden with RB30E / RB30ET / RB30S (2962cc Inline-6)

Fitment Notes

• The .025 suffix designates this as the +0.025mm oversize bearing set - for use when the crankshaft rod journals have been ground 0.025mm undersize. For standard journal diameter, use 6B2390H-STD. For crankpins ground 0.25mm undersize, use 6B2390H-.25. For 0.50mm undersize, use 6B2390H-.50.
• This single set covers the Nissan VG30 V6 family (VG30E/ET/i/DE/DET/DETT) and VG33E, as well as the RB30 inline-6 family (RB30E/ET/S) - all share identical crankpin journal dimensions despite being architecturally different engines (V6 vs. Inline-6).
• 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 12 bearing shells (6 pairs) - sufficient for one full 6-cylinder engine build.
• UPC: 9315726316511

Features

• Tri-metal construction: copper-lead alloy lining bonded over a hardened steel backing, with a high-strength overlay plate - engineered for the high-boost sustained loads of the VG30DETT twin-turbo and the high-RPM demands of naturally aspirated VG30DE applications.
• Hardened steel backing on all rod bearings improves structural support of the bearing lining and maintains crush under high sustained loads and temperatures in both turbocharged and naturally aspirated builds.
• High-strength overlay plate with reduced thickness provides improved fatigue resistance compared to OEM-spec bearings - critical in modified VG30DETT builds running elevated boost pressure.
• 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 Nissan VG/RB 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 the 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: 6B2390H-.025
• Product Line: ACL Race Series
• Application: Connecting Rod Bearings
• Engine Compatibility: Nissan VG30E/ET/i (2960cc V6 SOHC); VG30DE/DET/DETT (2960cc V6 DOHC); VE30DE (2960cc V6 DOHC); VG33E (3275cc V6 SOHC); RB30E/ET/S (2962cc Inline-6 SOHC)
• Crankshaft Size: +0.025mm Oversize (for crankpins ground 0.025mm undersize)
• Shaft (Crankpin) Diameter: 49.936-49.949mm (1.9660-1.9665 in)
• Tunnel (Housing Bore): 53.000-53.011mm (2.0866-2.0870 in)
• Maximum Wall Thickness at Crown: approx. 1.528mm (0.0602 in)
• Bearing Material: Tri-Metal Copper-Lead Alloy / Hardened Steel Backing
• Quantity: Set of 12 Shells (complete 6-cylinder engine set)
• UPC: 9315726316511

Included Components

• 12x Race Series Connecting Rod Bearing Shells - +0.025mm Oversize

Product Description

The ACL Race Series 6B2390H-.025 connecting rod bearing set is the +0.025mm oversize option for a broad family of Nissan engines sharing identical crankpin journal dimensions - spanning the VG30 V6 family (VG30E, VG30ET, VG30DE, VG30DET, VG30DETT, VG33E) and the RB30 inline-6 family (RB30E, RB30ET, RB30S). This versatile set covers everything from the naturally aspirated VG30E in the Maxima and Pathfinder, through the twin-turbocharged VG30DETT in the iconic Z32 300ZX, to the RB30 inline-6 found in the Australian-market Holden Commodore VL. This oversize set is selected when crankshaft rod journals have been ground 0.025mm undersize to address light surface wear or achieve a specific oil clearance target.

Built on ACL's Race Series tri-metal platform, these bearings deliver superior fatigue resistance and oil film stability over OEM Nissan shells. The VG30DETT is particularly well served by ACL Race bearings, where high-boost twin-turbo operation places elevated and sustained loads on the rod bearing system. Sold as a complete set of 12 shells for one 6-cylinder engine.