If you're looking to boost your engine's performance, you can't go wrong with ACL Race Series Engine Bearings. These aren't just your average bearings; they’re crafted with a unique blend of design, metallurgy, and engineering that really shines when you push your engine to its limits. Whether you're running a 4, 6, or 8-cylinder setup, these bearings are built to handle the higher RPMs that come with serious driving.

What makes these bearings stand out? For starters, the high-strength overlay plate is thinner than you'd find in standard bearings, which means it has better fatigue properties. This is crucial when you're putting your engine through its paces. The hardened steel backs on all the rod bearings provide solid support for the bearing lining and help keep everything securely in place.

Speaking of security, the increased crush on these bearings improves retention, so you won’t have to worry about them shifting around during intense drives. Plus, the elimination of flash plating on the back enhances heat transfer, ensuring that the bearings stay cool and maintain a solid grip in their housing. This is a game-changer, especially when you're pushing your engine hard.

One of the clever design features is the increased eccentricity, which compensates for any bore distortion at high RPMs. This helps form those all-important hydrodynamic oil films that keep everything lubricated and running smoothly. And with 3/4 grooved main bearings, you get optimized load-carrying surface area and improved oil flow to the conrod bearings. It’s all about maximizing performance.

Now, let’s talk specs. These bearings come in sizes ranging from STD to 020, with standard oil clearance. They’re designed as upper and lower half types, made from tri-metal with hardened steel backs. The minimum standard shaft size is 2.2482 inches, while the max is 2.249 inches. For the tunnel sizes, you’re looking at a minimum of 2.4412 inches and a maximum of 2.442 inches. The wall at the crown measures up to 0.0957 inches, and they have an overall length of 0.885 inches.

These bearings fit a variety of classic Ford models, including the Fairlane from '55 to '70, the Falcon from '60 to '70, and Mustangs from '64 to '73 and '79 to 2022, including the GT models from '15 to '22. If you’re working on a Mustang II from '74 to '78, they fit that too. Just a heads-up for those running the V8 255/289/302—these .30mm oversized main bearing sets are a solid choice.

In short, if you're serious about performance and reliability, these ACL Race Series Engine Bearings are worth considering. They’ve got the specs and features that can make a real difference when it matters most.