If you’re serious about performance, you know that the right engine bearings can make all the difference. That’s where the ACL Race Series Engine Bearings come into play. These aren’t just any bearings; they’re a well-thought-out blend of design, metallurgy, and engineering that can handle the demands of higher RPMs without breaking a sweat. Whether you’re working on a 4, 6, or 8-cylinder setup, these bearings are built to keep your engine purring smoothly under pressure.

One of the standout features is the high-strength overlay plate. It’s thinner than what you might find in standard bearings, which actually improves fatigue properties. You want your setup to last, right? The hardened steel backs on the rod bearings are another bonus, providing solid support for the lining and helping to keep everything in place. No one wants to deal with a bearing that’s shifted out of position mid-race.

Speaking of support, the increased crush on these bearings improves retention, ensuring they stay put even when the engine's pushing hard. Plus, they’ve eliminated flash plating on the back, which enhances heat transfer. This means better grip between the bearings and housing, so you can count on them when the heat is on. And let’s not forget about the increased eccentricity, which compensates for any bore distortion at high RPMs. This little detail helps form those crucial hydrodynamic oil films that keep everything lubricated just right.

Now, if you’re into specifics, the 3/4 grooved main bearings optimize the load-carrying surface area and oil flow to the conrod bearings. And with tight, consistent wall tolerances, you can maintain those clearances you need for a well-tuned engine. The enlarged ID chamfers on the edges accommodate larger fillet radii on performance crankshafts, making installation a breeze.

As for specs, these bearings come in various sizes—STD, .025, .25, and 0.5—so you can find the perfect fit for your project. The oil clearance is standard, and they’re made from a solid mix of aluminum, tin, and silicon. Here’s a quick rundown of the dimensions: the minimum standard shaft size is 2.0466 inches, with a max of 2.0472 inches. The tunnel sizes range from 2.1654 to 2.1661 inches, and the max wall thickness at the crown is 0.0591 inches.

So if you’re working on a Subaru Legacy from 1990 to 2017, these bearings fit perfectly with the EJ20, EJ22, and EJ25 engines, especially if you're looking at a 52mm journal size. Trust me, when you’re pushing your engine to its limits, you want bearings that are up for the challenge. The ACL Race Series Engine Bearings deliver that and more.