If you’re diving into the world of high-performance engines, you’ve probably heard of ACL Race Series Engine Bearings. These bad boys are crafted with a unique blend of design, metallurgy, and engineering that really hits the mark for what you need when you’re pushing your engine to its limits. Whether you’re rocking a 4, 6, or 8-cylinder setup, these bearings are ready to take on the challenge, especially if you’re running higher RPMs. Trust me, they’re built for it.

One of the standout features is the high-strength overlay plate, which is thinner than what you might find on standard bearings. This isn’t just for show; it significantly improves fatigue properties, meaning they can handle the stress without giving up. And let’s talk about the hardened steel backs on all the rod bearings. They provide solid support for the bearing lining and help keep everything snug in the housing. You don’t want any slippage when you’re revving high, right?

Another thing I appreciate is the increased crush. It’s a simple tweak, but it really helps with bearing retention. Plus, they’ve eliminated the flash plating on the back, which enhances heat transfer. This means better grip between the bearings and the housing, keeping everything running smoothly even under pressure.

These bearings also come with increased eccentricity, which is essential for compensating for any bore distortion at those high RPMs. This feature helps in forming hydrodynamic oil films, ensuring that your engine stays well-lubricated. And if you’re worried about oil flow, the 3/4 grooved main bearings optimize load-carrying surface area, directing oil right to the conrod bearings where it’s needed most.

Consistency is key in performance, and ACL has nailed it with tight wall tolerances that help maintain those all-important clearances. Plus, they’ve added enlarged ID chamfers on the bearing edges where it counts, accommodating larger fillet radii on performance crankshafts without a hitch.

Now, let’s get into the specs because I know you’re curious:

• Sizes available: STD, .025, .25, .50
• Oil Clearance: Standard
• Half Type: Identical Halves
• Material: Tri-metal Hardened Steel Backs
• Min Std Shaft Size: 1.8892in / 47.985 mm
• Max Std Shaft Size: 1.8898in / 48.000 mm
• Min Std Tunnel Size: 2.008in / 51.004 mm
• Max Std Tunnel Size: 2.0088in / 51.024 mm
• Max Wall at Crown: 0.0586in / 1.488 mm
• Max Overall Length: 0.8386in / 21.30 mm

For those running a Toyota 4 from 1995 to 2164cc (3SF/3SG/5SF), this 0.75mm oversized main bearing set is a solid choice. If you’re serious about getting the most out of your engine, these bearings are worth considering. They’re not just parts; they’re a crucial element in your performance build.