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The ACL 6B2639H-.25 Race Series Rod Bearing Set (0.25mm Oversized) is the best high-performance bearing upgrade for Nissan VQ35HR and VQ37VHR engines found in Infiniti G35/G37/Q50/Q60, Nissan 350Z/370Z, and other models. Engineered for high-RPM, boosted, or race applications, these bearings feature tri-metal construction, high-strength overlay, and precision sizing for maximum load capacity, reduced friction, and superior oil clearance – ideal for naturally aspirated, turbo, or supercharged builds pushing the limits of the VQ engine family.
| Specification | Detail |
|---|---|
| Part Number | 6B2639H-.25 |
| Bearing Type | Race Series Rod Bearings (0.25mm Oversized) |
| Material | Tri-Metal (Steel Back, Copper-Lead, High-Strength Overlay) |
| Engine | Nissan VQ35HR / VQ37VHR (Infiniti & Nissan V6) |
| Compatibility | Infiniti G35/G37/Q50/Q60, Nissan 350Z/370Z, FX35/FX37, EX35/EX37, M35/M37, QX50/QX70 |
| Oversize | 0.25mm |
| Quantity | Set of 12 (6 pairs) |
| Installation | Requires Engine Disassembly & Proper Clearance Check |
| Country of Origin | Australia |
| Warranty | Limited (ACL) |
| Year | Make | Model | Notes |
|---|---|---|---|
| 2007-2008 | Infiniti | G35 | VQ35HR (Base, Journey, Sport, X) |
| 2008-2013 | Infiniti | G37 | VQ37VHR (Base, IPL, Journey, Sport, X) |
| 2014-2024 | Infiniti | Q50 | VQ37VHR (Base, Red Sport 400, Hybrid, etc.) |
| 2014-2022 | Infiniti | Q60 | VQ37VHR (Luxe, Red Sport 400, etc.) |
| 2007-2009 | Nissan | 350Z | VQ35HR (Base, Enthusiast, Touring, Grand Touring, Nismo) |
| 2009-2020 | Nissan | 370Z | VQ37VHR (Base, Nismo, Sport, Touring, etc.) |
| Various | Infiniti | EX35/EX37, FX35/FX37, M35/M37, QX50/QX70 | VQ35HR/VQ37VHR Engines |
ACL manufactures performance engine bearings used in race engines across a wide range of motorsports disciplines, from sport compact and drift racing to oval track, drag racing, and land speed record applications. ACL Race Series bearings use a specialized tri-metal construction with a proprietary copper-lead alloy overlay that provides excellent load capacity, conformability, and wear resistance under the high RPM and cylinder pressure conditions of performance engines. Popular ACL Race Series Bearing Applications ACL Race Series bearings are available for main bearings, connecting rod bearings, and thrust washers across a broad range of American, Japanese, and European performance engines including Honda, Toyota, Subaru, Mitsubishi, Nissan, Ford, Chevrolet, and Dodge applications. ACL bearings are manufactured to OEM dimensional tolerances and are available in standard, 0.001-inch, 0.010-inch, and 0.020-inch undersize options to accommodate different crankshaft regrind specificati...
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