If you're diving into the world of high-performance engines, you’ll appreciate the craftsmanship behind the ACL Race Series Engine Bearings. These aren't just any bearings; they’re engineered for those who push their engines to the limit. Designed with a unique blend of metallurgy and engineering, these bearings can handle higher RPMs without breaking a sweat. Whether you’re working on a 4, 6, or 8-cylinder setup, there’s a fit for your needs.

One of the standout features is the high-strength overlay plate, which has a reduced thickness to boost its fatigue properties. This means you can trust these bearings to hold up under pressure. The hardened steel backs on all the rod bearings provide solid support for the lining, ensuring they stay put in the housing. Plus, with increased crush, you get better retention, so you won’t have to worry about them shifting around when the engine is revving high.

Heat management is crucial in performance applications, and ACL thought of that too. They’ve eliminated flash plating on the back of the bearings to enhance heat transfer and maximize grip between the bearings and their housing. This is a game-changer for maintaining optimal performance during those intense drives.

When you’re pushing your engine, distortion can happen at high RPMs. That’s why these bearings have increased eccentricity, which helps manage bore distortion while supporting the formation of hydrodynamic oil films. And those 3/4 grooved main bearings? They’re designed to optimize load-carrying surface area and direct oil flow right where you need it—straight to the conrod bearings.

With tight and consistent wall tolerances, you’ll maintain reliable clearances, which is essential for performance. Plus, the enlarged ID chamfers on the bearing edges accommodate larger fillet radii on performance crankshafts, making installation a breeze.

Now, let’s talk specs. These bearings come in a standard size (STD), with an oil clearance of +0.001" extra, and they feature identical halves for easy installation. Made from tri-metal with hardened steel backs, they can handle the demands of your performance engine. The minimum standard shaft size is 2.0860" (52.984mm), and the maximum is 2.0867" (53.002mm). For tunnel sizes, the minimum is 2.2388" (56.866mm), and the maximum is 2.2396" (56.886mm). The wall at the crown maxes out at 0.0754" (1.91mm), and the overall length is 0.825" (20.96mm).

In short, if you’re serious about your engine build and want bearings that can keep up with your performance goals, the ACL Race Series Rod Bearings are a solid choice. Just remember, you’ll need 8 for a full set for your Ford V8 4.6L/5.4L. Get ready to feel the difference!