If you're diving into the world of high-performance engines, you know that every little detail counts. That's where the ACL Race Series Engine Bearings come into play. These aren't just any bearings; they're a solid blend of smart design, tough metallurgy, and precise engineering that really delivers when it matters most. Whether you're revving up a 4, 6, or 8-cylinder setup, these bearings are built to handle those higher RPMs without breaking a sweat.

One of the standout features is the high-strength overlay plate. It's thinner but packs a punch in terms of fatigue resistance, which means you can push your engine harder without worrying about wear and tear. Plus, the hardened steel backs on the rod bearings provide extra support for the lining, making sure everything stays put in its housing. You’ll appreciate the increased crush too; it really helps with bearing retention, so you won’t have to second-guess your setup.

Another cool aspect is the elimination of flash plating on the back of the bearings. This little tweak improves heat transfer, which is crucial when you're pushing your engine to the limit. The bearings also have increased eccentricity to help deal with bore distortion at high RPMs, assisting in forming those all-important hydrodynamic oil films. And for those of you who are serious about performance, the 3/4 grooved main bearings optimize load carrying and oil flow to the conrod bearings—definitely a game-changer.

Speaking of precision, these bearings come with tight, consistent wall tolerances, which is key for maintaining clearances that can make or break your engine’s performance. The enlarged ID chamfers on the edges are designed to fit larger fillet radii on performance crankshafts, ensuring a snug fit where it counts.

Now, let’s talk specs. You can get these bearings in sizes like STD, .025, and .25, with standard oil clearance and identical halves. They’re made from tri-metal hardened steel backs, and when it comes to sizing, they fit a standard shaft size ranging from 2.2435 in to 2.2441 in. The tunnel size is also spot on, between 2.4016 in and 2.4024 in, ensuring you get that perfect fit every time. The max wall at the crown is 0.0783 in, and the overall length is about 0.8268 in.

These bearings are compatible with a range of Mitsubishi models, including the Eclipse from 1990 to 2011, the Galant from 1994 to 2012, and the Outlander from 2003 to 2015. If you're working on a Mitsubishi engine, specifically the 4G63/4G64, you’ll want to check out the 5M1219-STD ACL bearing set. They’re a solid investment for anyone serious about squeezing out every bit of performance from their ride.