If you're looking to boost your engine's performance without sacrificing reliability, you might want to check out these ACL Race Series Engine Bearings. They’re crafted with a unique blend of design and metallurgy that really stands up to the demands of high RPM driving. Whether you're pushing a 4, 6, or 8-cylinder setup, these bearings are built to handle it.

What sets these apart? For starters, the high-strength overlay plate is thinner than what you might find in typical bearings. This isn’t just for show; it actually improves fatigue resistance, which is crucial when you’re revving high. Plus, all the rod bearings come with hardened steel backs. This adds support to the bearing lining and helps keep everything snug in the housing. No one wants their bearings shifting around when they’re pushing their ride to the limit.

Another cool feature is the increased crush, which helps with bearing retention. You want these things to stay put, especially under heavy loads. They’ve also ditched the flash plating on the back of the bearings. This little tweak makes a big difference in heat transfer, helping to keep things cool and ensuring a solid grip between the bearings and their housing. Trust me, you’ll appreciate that when you’re running hard.

And if you’re worried about bore distortion at high RPMs, these bearings have increased eccentricity to help form those hydrodynamic oil films. The 3/4 grooved main bearings are a nice touch too—they optimize the load-carrying surface area and improve oil flow to the conrod bearings. This means better lubrication and less wear over time.

As for the specs, these bearings come in sizes STD, .025, and .25, with standard oil clearance. They feature identical halves, so installation is straightforward. Made from tri-metal hardened steel backs, they’re built to last. The minimum standard shaft size is 2.3616 inches, while the maximum is 2.3622 inches. For tunnel sizes, you’re looking at a minimum of 2.5197 inches and a maximum of 2.5205 inches. The wall at the crown tops out at 0.0789 inches, and the overall length is 0.748 inches. These precise measurements help you maintain consistent clearances, which is key for performance engines.

These bearings are a perfect fit for the Subaru Legacy from 1990 to 2017, specifically for the EJ20, EJ22, and EJ25 engines, particularly in the thrust position #5. If you’re serious about your build and want something that can take the heat while keeping everything running smooth, you might want to add these to your shopping list.