If you're looking to push your engine to its limits, the ACL Race Series Engine Bearings are a solid choice. These aren't just any bearings; they’re designed with a unique blend of engineering and metallurgy that really stands out, especially when you start cranking up the RPMs. I’ve had my hands on these for a while now, and trust me, they deliver the kind of performance you’d expect from high-end race components.

One of the standout features is the high-strength overlay plate. It’s got a reduced thickness that really enhances fatigue properties, which is crucial when you're revving hard. Plus, the hardened steel backs on all the rod bearings provide solid support for the bearing lining. This isn’t just about durability; it also helps keep everything locked in place, so you don’t have to worry about any slipping or movement in the housing.

The increased crush on these bearings is another neat touch. It helps with retention, so you can be confident that your setup is going to stay tight even under the most demanding conditions. And let’s talk about heat transfer—ACL has eliminated flash plating on the back of these bearings, which means better heat dissipation and improved grip with the housing. That’s a game-changer for anyone who’s pushing their engine hard.

Now, if you’re running at high RPMs, you’ll appreciate the increased eccentricity. It compensates for any bore distortion and helps form those all-important hydrodynamic oil films. And for those of you who are concerned about oil flow, the 3/4 grooved main bearings optimize the load-carrying surface area, ensuring that oil gets where it needs to go—especially to the conrod bearings.

These bearings also come with tight, consistent wall tolerances, which is essential for maintaining those clearances you need for performance. And if you’ve got a performance crankshaft, the enlarged ID chamfers on the bearing edges are designed to accommodate larger fillet radii, so you won’t run into any issues there.

In terms of specs, you’ve got options with sizes like STD, .025, and .25. The oil clearance is standard, and the half type is identical halves, which simplifies installation. Made from tri-metal hardened steel backs, these bearings are built to last. For those of you working with Mitsubishi engines, specifically the 6G72, this set is compatible with a shaft size ranging from 2.3614 inches to 2.3622 inches, and a tunnel size from 2.5197 inches to 2.5205 inches. With a max wall thickness of 0.0783 inches and an overall length of 0.714 inches, they’re designed to fit perfectly in your setup.

So if you’re gearing up for some serious performance work on your Mitsubishi 2972CC, these ACL bearings are definitely worth considering. They’ve got the specs and features to back them up, and from my experience, they can handle whatever you throw at them.