If you're diving into the world of high-performance engines, you know how crucial it is to have reliable components that can keep up with the demands of spirited driving. That’s where the ACL Race Series Engine Bearings come into play. These aren’t just your run-of-the-mill bearings; they’re designed specifically for those of us who push our engines to the limit, whether you’re revving up a 4, 6, or 8-cylinder beast.

What makes these bearings stand out? For starters, the unique blend of design, metallurgy, and engineering is impressive. The high-strength overlay plate is thinner, which actually enhances its fatigue properties. This means you can count on them to hold up even when the RPMs are climbing. Plus, the hardened steel backs on all the rod bearings provide solid support, helping the bearing lining stay put in its housing. Trust me, that’s a big deal when you’re dealing with the forces at play in a high-performance setup.

One of the standout features is the increased crush for better bearing retention. You won’t have to worry about these bearings shifting around when you’re pushing your engine hard. And they’ve done away with flash plating on the back, which really helps with heat transfer. That’s crucial for keeping your engine running cooler and maximizing the grip between the bearings and the housing.

Now, if you’re wondering about high RPM performance, these bearings have increased eccentricity to tackle bore distortion and help form those all-important hydrodynamic oil films. The 3/4 grooved main bearings optimize the load-carrying surface area and ensure oil flows smoothly to the conrod bearings. And with tight, consistent wall tolerances, you can maintain the clearances you need for peak performance.

For those of you running performance crankshafts, the enlarged ID chamfers on the bearing edges are a thoughtful touch. They accommodate larger fillet radii, which is something you’ll appreciate when you’re fine-tuning your setup.

In terms of specs, these bearings come in various sizes—STD, .025, .25, and 0.5—so you can find the right fit for your engine. They offer standard oil clearance and are made from tri-metal hardened steel backs. The dimensions are spot on, with a minimum standard shaft size of 2.3616 inches and a maximum of 2.3622 inches. The tunnel sizes range from 2.5194 to 2.5205 inches, and they’ve got a max wall at the crown of 0.0789 inches.

These bearings are perfect for several Subaru models, including the Forester (1998-2017), Impreza (1993-2017), and Legacy (1990-2017). If you’re working on an EJ18, EJ20, EJ22, or EJ25 engine, the 0.75mm oversized main bearing set is specifically designed for thrust in the #3 position. So, if you’re ready to take your build to the next level, these bearings might just be what you need.