If you're looking to push your engine to its limits, the ACL Race Series Engine Bearings are worth considering. These aren't just any bearings; they’re built with a unique blend of design, metallurgy, and engineering that really delivers when it comes to high-performance driving. I’ve had my share of experiences with various bearings, and I can tell you, these are designed to handle those higher RPMs that make your heart race.

What really stands out is the high-strength overlay plate. It’s thinner than what you might find in standard options, which means better fatigue properties. This is crucial when you’re really pushing your engine. Plus, the hardened steel backs on all rod bearings give you that extra support for the bearing lining, ensuring they stay put in the housing, even when things get intense.

Another cool feature is the increased crush that helps with bearing retention. No one wants to deal with a bearing that’s moving around when you’re trying to get the most out of your ride. And let’s not forget about the elimination of flash plating on the back of the bearings. This little detail makes a big difference in heat transfer and helps maximize the grip between the bearings and their housing—essential for maintaining performance under pressure.

These bearings also come with increased eccentricity, which is great for compensating for bore distortion at high RPMs. That means better hydrodynamic oil film formation, allowing your engine to run smoother. The 3/4 grooved main bearings optimize the load-carrying surface area and oil flow to the conrod bearings, which is something you’ll appreciate when you’re on the track or just enjoying a spirited drive.

With tight, consistent wall tolerances, you can maintain those clearances you need for a reliable performance. And if you’re working with performance crankshafts, the enlarged ID chamfers on the bearing edges will accommodate larger fillet radii without a hitch.

As for specs, these bearings come in various sizes: STD, 001, 009, 010, 011, and 020, with standard oil clearance. They’re half-type, meaning you’ll get both upper and lower halves. Made from tri-metal with hardened steel backs, they’re built to last. The minimum standard shaft size is 2.7482 inches, and the maximum is 2.7492 inches, while the tunnel sizes range from 2.937 to 2.938 inches. The max wall thickness at the crown is 0.0934 inches, and the overall length is around 1.0433 inches.

These bearings fit a variety of vehicles, including:

• Chevrolet Avalanche 2007-2013
• Chevrolet Avalanche 1500 2002-2006
• Chevrolet Avalanche 2500 2002-2006
• Chevrolet Bel Air 1950-1975 & 1981
• Chevrolet Chevelle 1964-1974
• Chevrolet El Camino 1975-1987
• Chevrolet Express 1996-2020

So, if you're running a Chevrolet V8 396/402/427/454, these standard size main bearing sets are a solid choice. Trust me, once you try them out, you’ll feel the difference in performance.