If you're pushing your engine to the limits, you know how crucial it is to have reliable components that can keep up. That’s where these ACL Race Series Engine Bearings come into play. They're not just your run-of-the-mill bearings; they’re designed for high-performance setups, built to handle those higher RPMs without breaking a sweat.

What really sets these bearings apart is the thoughtful blend of design and metallurgy. The high-strength overlay plate is thinner, which means it’s got improved fatigue properties. That’s a big deal when you’re running at high speeds. And let’s not forget the hardened steel backs on all the rod bearings. They provide solid support for the bearing lining and help keep everything snug in the housing—no one wants their bearings slipping around when the engine’s roaring.

Another cool feature is the increased crush. This helps with bearing retention, so you can be confident that everything’s staying put, even under intense conditions. Plus, they’ve eliminated flash plating on the back of the bearings. This isn’t just a fancy term; it actually improves heat transfer and enhances the grip between the bearings and their housing. When you’re pushing your engine hard, every little bit helps.

And if you’re worried about bore distortion at high RPMs, these bearings have increased eccentricity to help out with that. They assist in forming hydrodynamic oil films, which is essential for keeping everything lubricated and running smoothly. The 3/4 grooved main bearings optimize the load-carrying surface area and ensure that oil flows efficiently to the conrod bearings—another win for performance.

Consistency is key in any high-performance build, and these bearings deliver with tight wall tolerances that help you maintain those critical clearances. Plus, they’ve got enlarged ID chamfers on the edges where necessary, accommodating those larger fillet radii on performance crankshafts without a hitch.

In terms of specifications, these bearings are designed with innovative manufacturing techniques that prioritize safety and reliability. You can trust that the engineering behind them is precise, ensuring you’re getting quality that stands up to the rigors of racing or spirited driving.

These bearings are compatible with a range of vehicles, including the Ford Probe from '89 to '97 and the Mazda MX-6 from '88 to '92, as well as the Mazda Protege from '90 to '03. If you’re running a Mazda 1991CC FS, this 1.00mm oversized rod bearing set is just what you need to keep your engine performing at its best.