ACL 6B2960H-.25 Race Rod Bearing Set +0.25mm Nissan RB25DET RB26DETT Skyline GTR

Vehicle Fitment

• 1993-1998 Nissan Skyline (R33 GTS-T / GTS25-T) - RB25DET 2.5L DOHC 24v Turbo Inline-6
• 1999-2002 Nissan Skyline (R34 GT-T / GT-Four) - RB25DET NEO 2.5L DOHC 24v Turbo Inline-6
• 1989-1993 Nissan Skyline (R32 GT-R) - RB26DETT 2.6L DOHC 24v Twin Turbo Inline-6
• 1993-1998 Nissan Skyline (R33 GT-R) - RB26DETT 2.6L DOHC 24v Twin Turbo Inline-6
• 1999-2002 Nissan Skyline (R34 GT-R) - RB26DETT 2.6L DOHC 24v Twin Turbo Inline-6
• 1993-2001 Nissan Stagea (WC34) - RB25DET / RB25DE 2.5L DOHC Inline-6
• Various Nissan Cedric / Gloria / Leopard - RB25DE / RB25DET naturally aspirated and turbocharged

Fitment Notes

• The .25 suffix designates this as the +0.25mm oversize bearing set - for use when the crankshaft rod journals have been ground 0.25mm undersize. This is the more significant regrind step, typically required when journals have suffered deeper wear or surface damage beyond what the .025mm step can address. For standard journal diameter, use 6B2960H-STD. For crankpins ground 0.025mm undersize, use 6B2960H-.025. For 0.50mm undersize, use 6B2960H-.50.
• This set covers both the RB25 (2498cc) and RB26 (2568cc) inline-6 families - they share identical crankpin journal dimensions. Do not confuse with 6B2630H (smaller-journal RB20/VQ30 engines) or 6B2390H (VG30/RB30 families).
• 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.

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, high-RPM demands of the RB25DET and the RB26DETT twin-turbo used in all three generations of the Nissan Skyline GT-R.
• Hardened steel backing on all rod bearings improves structural support of the bearing lining and maintains crush under the extreme sustained boost loads of the RB26DETT.
• High-strength overlay plate with reduced thickness provides improved fatigue resistance compared to OEM-spec bearings - critical in RB25/RB26 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 RB-series 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: 6B2960H-.25
• Product Line: ACL Race Series
• Application: Connecting Rod Bearings
• Engine Compatibility: Nissan RB25DE (2498cc DOHC Inline-6); RB25DET / RB25DET NEO (2498cc DOHC Turbo Inline-6); RB26DETT (2568cc DOHC Twin-Turbo Inline-6)
• Crankshaft Size: +0.25mm Oversize (for crankpins ground 0.25mm undersize)
• Shaft (Crankpin) Diameter: 47.724-47.737mm (1.8789-1.8794 in)
• Tunnel (Housing Bore): 51.000-51.013mm (2.0079-2.0084 in)
• Maximum Wall Thickness at Crown: approx. 1.628mm (0.0641 in)
• Maximum Overall Length: 17.1mm (0.673 in)
• Bearing Material: Tri-Metal Copper-Lead Alloy / Hardened Steel Backing
• Quantity: Set of 12 Shells (complete 6-cylinder engine set)

Included Components

• 12x Race Series Connecting Rod Bearing Shells - +0.25mm Oversize

Product Description

The ACL Race Series 6B2960H-.25 connecting rod bearing set is the +0.25mm oversize option for the Nissan RB25 and RB26 inline-6 engine families - covering the turbocharged RB25DET in the R33 and R34 Skyline GTS-T/GT-T and Stagea, and the twin-turbocharged RB26DETT across all three generations of the Nissan Skyline GT-R (R32, R33, R34). Both engines share identical crankpin journal dimensions, making this a single set for either family at the +0.25mm oversize step. This bearing is selected when rod journals have been ground 0.25mm undersize - a more significant regrind required when journals have sustained deeper wear or scoring that the finer .025mm step cannot correct.

Built on ACL's Race Series tri-metal platform, these bearings deliver superior fatigue resistance and oil film stability over OEM Nissan shells - a trusted choice for RB26DETT builds where high-boost operation at 400-700+ hp demands consistent bottom-end reliability. Always confirm clearances at assembly. Sold as a complete set of 12 shells for one 6-cylinder engine.