ACL 6B2960H-.025 Race Rod Bearing Set +0.025mm Nissan RB25DET RB26DETT Skyline

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
• 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
• 1989-1993 Nissan Skyline (R32 GT-R) - RB26DETT 2.6L DOHC 24v Twin Turbo Inline-6
• 1993-2001 Nissan Stagea (WC34) - RB25DET / RB25DE 2.5L DOHC Inline-6
• 1989-1993 Nissan Skyline (R32 GTS-T) - RB20DET (note: uses 6B2630H); R32 GT-R uses RB26DETT (this set)
• Various Nissan Cedric / Gloria / Leopard - RB25DE / RB25DET naturally aspirated and turbocharged

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 6B2960H-STD. For crankpins ground 0.25mm undersize, use 6B2960H-.25. 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 (for the smaller-journal RB20/VQ30 engines) or 6B2390H (for the VG30/RB30 families).
• An HX extra-clearance variant (6B2960HX-STD) is available for builders targeting approximately 0.025mm (0.001") additional running clearance at standard journal diameter without crankshaft grinding.
• 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 legendary 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 - which in stock form produces 280 hp and in built form routinely exceeds 600 hp.
• 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-.025
• 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: +0.025mm Oversize (for crankpins ground 0.025mm undersize)
• Shaft (Crankpin) Diameter: 47.949-47.962mm (1.8878-1.8883 in)
• Tunnel (Housing Bore): 51.000-51.013mm (2.0079-2.0084 in)
• Maximum Wall Thickness at Crown: approx. 1.516mm (0.0597 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 - +0.025mm Oversize

Product Description

The ACL Race Series 6B2960H-.025 connecting rod bearing set is the +0.025mm oversize option for the Nissan RB25 and RB26 inline-6 engine families - spanning the turbocharged RB25DET found in the R33 and R34 Skyline GTS-T/GT-T and Stagea, through to the iconic RB26DETT twin-turbo that powered all three generations of the Nissan Skyline GT-R (R32, R33, R34). The RB25 and RB26 share identical crankpin journal dimensions, making a single bearing set applicable across both engine families at the +0.025mm oversize step. This set is selected when 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 are a trusted choice in the RB26DETT community - where high-boost builds demanding sustained reliability at 400-700+ hp require bearing quality that OEM shells cannot consistently provide. Always confirm clearances at assembly. Sold as a complete set of 12 shells for one 6-cylinder engine.