If you're diving into the world of high-performance engines, you know that every little detail matters. That's where the ACL Race Series Engine Bearings come into play. These aren't just any bearings; they’re designed with a unique blend of design, metallurgy, and engineering to meet the demands of serious drivers. Built to handle those higher RPMs, these bearings are perfect for a range of popular 4, 6, and 8-cylinder setups.

What sets these bearings apart? First off, they boast a high-strength overlay plate that’s thinner than what you might find elsewhere. This isn’t just a design choice—it significantly improves fatigue resistance, which is crucial when you’re pushing your engine hard. And let’s talk about the hardened steel backs on all rod bearings. This feature not only supports the bearing lining but also helps keep everything snug in the housing, so you can focus on the road ahead without worrying about your engine’s internals.

One of the standout features is the increased crush, which enhances bearing retention. This means they stay put, even when the going gets tough. Plus, they've eliminated flash plating on the back of the bearings. This little tweak makes a big difference in heat transfer, ensuring that your bearings stay cool under pressure and maintain a solid grip in their housing.

Now, if you’re pushing your engine to the limit, you’ll appreciate the increased eccentricity. This helps compensate for any bore distortion at high RPMs and aids in forming those all-important hydrodynamic oil films. And for those of you who are serious about optimizing performance, the 3/4 grooved main bearings are a game changer. They maximize the load-carrying surface area and improve oil flow to the conrod bearings, which is exactly what you want when you’re going full throttle.

Consistency is key in performance builds, and these bearings deliver with tight, consistent wall tolerances that help you maintain those critical clearances. Plus, the enlarged ID chamfers on the edges accommodate larger fillet radii on performance crankshafts, making installation a breeze.

Now for the nitty-gritty specs: these bearings come in a standard size (STD) with an extra oil clearance of +0.001". They feature identical halves and are made from tri-metal hardened steel backs. If you’re wondering about dimensions, they fit a minimum standard shaft size of 1.7713 inches and a maximum of 1.7717 inches, with tunnel sizes ranging from 1.8898 inches to 1.8096 inches. The max wall at the crown is 0.0583 inches, and the overall length is 0.925 inches. All of this means you’re getting a product that’s engineered for performance and reliability.

So, if you’re looking to boost your Mitsubishi 4G63/4G64 6 Bolt 1st Gen DSM, these bearings are a solid choice. They’ve got the performance chops to back up your ambitions, and you’ll appreciate the attention to detail that ACL has put into every aspect of their design.