If you're looking to push your ride to the limit, you might want to check out these ACL Race Series Engine Bearings. They’re not just another set of bearings; they’re crafted from a unique blend of design, metallurgy, and engineering that really delivers when it counts. I’ve had my fair share of experiences with bearings, and let me tell you, these guys are built to handle the heat—literally. They’re designed for those high RPM conditions that make your engine roar, and they fit a bunch of popular 4, 6, and 8 cylinder setups.

What sets these bearings apart? For starters, they've got a high-strength overlay plate that's thinner than what you might typically find, which means better fatigue resistance. This is crucial when you’re pushing your engine hard. The hardened steel backs on the rod bearings not only provide solid support for the lining but also help keep everything snug in the housing, so you won’t have to worry about them slipping out of place.

And let’s talk about crush—these bearings have increased crush for better retention, which is a must when you’re dealing with the forces at high RPMs. Plus, they’ve eliminated the flash plating on the backs, which improves heat transfer and maximizes grip in the housing. That’s a game changer when you’re trying to keep things cool under pressure.

Another feature I appreciate is the increased eccentricity. This compensates for bore distortion at high RPM, helping to form those hydrodynamic oil films that keep everything lubricated. The 3/4 grooved main bearings are designed to optimize the load-carrying surface area and ensure oil flows smoothly to the conrod bearings—no one wants a starved engine, right?

When it comes to tolerances, these bearings are tight and consistent, so you can maintain clearances that are spot on. They even have enlarged ID chamfers on the edges where it matters, accommodating larger fillet radii on performance crankshafts. It’s the little details that make a big difference.

As for specs, you’ve got options for sizes like STD, 001, 009, 010, 011, and 020, with standard oil clearance. They come in upper and lower half types, and the tri-metal hardened steel backs are built to last. If you’re curious about shaft sizes, they fit standard sizes between 2.1228 inches and 2.1236 inches, and for tunnel sizes, you’re looking at 2.239 inches to 2.2398 inches. The wall at the crown maxes out at 0.0575 inches, with an overall length of 0.726 inches.

These bearings are a perfect fit for classics like the Ford Fairlane (1955-1970), Falcon (1960-1970), and Mustangs from 1964 to 2022, including the GT models. If you’re rebuilding or just looking to upgrade, these ACL bearings are a solid choice that can handle the demands of performance driving.