If you're looking to push your engine to the limit, the ACL Race Series Engine Bearings are where it's at. These bearings are crafted with a blend of smart design, solid metallurgy, and engineering know-how that really delivers when you're hitting those high RPMs. They're not just another part on the shelf; they're built for serious performance in popular 4, 6, and 8 cylinder setups.

What's cool about these bearings is the high-strength overlay plate. It’s thinner than what you might find in standard bearings, which means it can handle fatigue better. And if you’ve ever dealt with the frustration of bearings slipping, you’ll appreciate the hardened steel backs on all the rod bearings. They really help keep the lining in place and ensure a snug fit in the housing.

Speaking of fit, the increased crush helps keep everything locked down tight. No one wants to worry about their bearings shifting under pressure. Plus, they've eliminated the flash plating on the back, which not only improves heat transfer but also maximizes grip between the bearings and housing. That’s a game changer when you're pushing your engine hard.

And let’s not forget about eccentricity. These bearings have been designed with increased eccentricity to handle bore distortion at those high RPMs. This feature also aids in forming hydrodynamic oil films, which is essential for keeping things lubricated and running smoothly. The 3/4 grooved main bearings are another highlight, optimizing the load-carrying surface area and ensuring oil flows precisely where it needs to go.

With tight, consistent wall tolerances, you can maintain your clearances just the way you want them. And for those of you running performance crankshafts, the enlarged ID chamfers on the bearing edges are a nice touch, accommodating larger fillet radii without a hitch.

Here are some specs that might interest you: these bearings come in standard, .025, and .25 sizes, with standard oil clearance. They’re available in both upper and lower half types, and the material mix includes aluminum, tin, and silicon. For those looking for precise measurements, the min standard shaft size is 2.7157 inches and max is 2.7165 inches, while the tunnel sizes range from 2.9142 inches to 2.9150 inches. The wall at the crown can go up to 0.0981 inches, and the overall length is about 0.921 inches.

These bearings are a perfect fit for various Toyota Land Cruiser models from 1989 to 2017, including the 7M7989-.50 ACL Toyota 6 4477cc 0.50mm oversized main bearing set for 93-98. If you're serious about performance, these bearings are definitely worth considering.