If you're looking to push the limits of your engine, you might want to check out these ACL Race Series Engine Bearings. They're not just another part; they’re a serious upgrade for anyone who knows their way around high-performance engines. Designed with a unique blend of design, metallurgy, and engineering, these bearings are built to handle those high RPMs that can really test the limits of your ride.

One of the standout features is the high-strength overlay plate. It’s thinner than what you might find in standard bearings, which means better fatigue resistance when you’re really pushing your engine. Plus, the hardened steel backs on all rod bearings provide solid support for the lining, ensuring they stay put even under intense conditions. You’ll appreciate the increased crush, too, which helps keep everything locked in place, reducing the chances of slippage.

Heat management is crucial, especially when you're revving high. That's why these bearings ditch the flash plating on the back. This allows for better heat transfer, keeping your engine cooler and maximizing the grip between the bearings and their housing. And with increased eccentricity, they compensate for any bore distortion that might occur at those high RPMs, which is essential for creating that hydrodynamic oil film that keeps everything lubricated and running smoothly.

Another cool feature is the 3/4 grooved main bearings. This design optimizes the load-carrying surface area and ensures oil flows efficiently to the conrod bearings. Consistent wall tolerances mean you can maintain reliable clearances, which is what you want for performance. And for those of you running performance crankshafts, these bearings come with enlarged ID chamfers on the edges to accommodate larger fillet radii.

Now, let’s dive into some specs. You can get these bearings in various sizes—STD, .025, and .25—so you can find the right fit for your setup. They have standard oil clearance and come in identical halves, which simplifies installation. Made from tri-metal with hardened steel backs, they’re built to last. The minimum standard shaft size is 2.3603 in (59.951 mm), and the maximum is 2.3612 in (59.975 mm). The tunnel sizes range from 2.5194 in (63.993 mm) to 2.5203 in (64.017 mm), and they have a maximum wall thickness of 0.0791 in (2.009 mm) with an overall length of 0.792 in (20.12 mm).

These bearings are a perfect fit for a range of Nissan models, including the Maxima from 1981 to 2008, the Murano from 2009 to 2018, and the Pathfinder from 1987 to 2012. Specifically, if you're working with the VQ35DE 3.5L V6 engine, the 0.025 oversized high-performance main bearing set (part number 4M2633H-.025) is a solid choice.

So, if you're serious about performance and want to give your engine the best chance to thrive under pressure, these ACL Race Series Engine Bearings are worth considering.