If you’re serious about your ride, you know how crucial the engine bearings are. That’s where the ACL Race Series Engine Bearings come into play. These aren’t just any bearings; they’re designed for those of us who push our engines to the limit. Whether you're running a 4, 6, or 8-cylinder engine, these bearings are built to handle higher RPM conditions without breaking a sweat.

What sets these bearings apart? For starters, the high-strength overlay plate is thinner than what you might find on standard bearings, which actually boosts fatigue resistance. This means you can rev higher without worrying about wear and tear. And let’s not forget about the hardened steel backs on all rod bearings—this feature not only supports the bearing lining but also keeps everything snug in the housing, so you can focus on the road ahead.

These bearings also sport increased crush for better retention, which is a game changer when you’re hammering down the throttle. Plus, the elimination of flash plating on the back enhances heat transfer, helping to keep things cool when the engine is hot. You’ll appreciate the increased eccentricity, too; it compensates for bore distortion at high RPM, making sure that hydrodynamic oil films form just right.

And if you’re curious about oil flow, the 3/4 grooved main bearings optimize the load-carrying surface area, ensuring that oil gets where it needs to go—right to those conrod bearings. Consistency is key in performance, and these bearings come with tight wall tolerances, so you can maintain those clearances without a hitch. Plus, they’ve got enlarged ID chamfers on the edges to fit those larger fillet radii on performance crankshafts.

As for specs, you’re looking at sizes like STD, .025, and .25, with standard oil clearance and identical halves. The tri-metal construction with hardened steel backs means these babies are built to last. They fit a range of models, including the Infiniti M35 and M45 from 2006 to 2010, the Infiniti Q45 from 2002 to 2006, and the Nissan 350Z from 2003 to 2009, along with the GTR from 2009 to 2021.

So, if you’re ready to take your engine’s performance up a notch, these ACL Race Series Engine Bearings might just be the upgrade you’ve been looking for.

• Size: STD, .025, .25
• Oil Clearance: Standard
• Half Type: Identical Halves
• Material: Tri-metal Hardened steel backs
• Min Std Shaft Size: 2.5178in / 63.952mm
• Max Std Shaft Size: 2.5182in / 63.962mm
• Min Std Tunnel Size: 2.7143in / 68.944mm
• Max Std Tunnel Size: 2.7153in / 68.968mm
• Max Wall at Crown: Std: 0.0982in / 2.495mm
• Max Overall Length: 0.791in / 20.10mm

Fits:

• Infiniti M35 2006-2010
• Infiniti M45 2006-2010
• Infiniti Q45 2002-2006
• Nissan 350Z 2003-2009
• Nissan GTR 2009-2021