If you're diving into the world of high-performance engines, you know how crucial it is to have the right parts. That’s where these ACL Race Series Engine Bearings come into play. These aren't just any bearings; they’re designed for serious drivers who push their machines to the limit. Whether you're working with a 4, 6, or 8-cylinder setup, these bearings are built to handle the heat—literally.

Let’s talk about what makes these bearings stand out:

• High Strength Overlay: The overlay plate is thinner but tougher, which means it can take more stress without wearing out as quickly. Less fatigue means longer-lasting performance.
• Hardened Steel Backs: All rod bearings come with hardened steel backs. This isn’t just for show; it helps keep the bearing lining in place and improves retention in the housing. No one wants a bearing that shifts around, right?
• Increased Crush: More crush means better bearing retention. It’s all about keeping everything snug and secure, especially when you’re revving high.
• Heat Transfer: They’ve eliminated flash plating on the back of the bearings. Why? To improve heat transfer and maximize the grip between the bearings and the housing. You want your bearings to stay cool and steady, especially at those high RPMs.
• Increased Eccentricity: This feature compensates for bore distortion when you're pushing the engine hard. It helps form hydrodynamic oil films, which is critical for smooth operation.
• 3/4 Grooved Main Bearings: This design optimizes load-carrying surface area and ensures oil flows smoothly to the conrod bearings. More oil where it counts means better performance.
• Tight Tolerances: Consistent wall tolerances help maintain clearances, which is key for engine longevity.
• Enlarged ID Chamfers: They’ve got you covered with chamfers on the bearing edges to fit those performance crankshafts with larger fillet radii.

Now, for the nitty-gritty specs:

• Sizes available: STD, .025, .25
• Oil Clearance: Standard
• Half Type: Upper & Lower
• Material: Tri-metal with hardened steel backs
• Min Std Shaft Size: 2.0450 in / 51.942 mm
• Max Std Shaft Size: 2.0457 in / 51.960 mm
• Min Std Tunnel Size: 2.2047 in / 56.000 mm
• Max Std Tunnel Size: 2.2054 in / 56.018 mm
• Max Wall at Crown: 0.0796 in / 2.022 mm
• Max Overall Length: 0.7087 in / 18.00 mm

These bearings are a perfect fit for the Hyundai Genesis from 2009 to 2016, specifically the G4KF 2.0T. If you’re looking to upgrade your engine’s internals, these high-performance main bearings are the way to go. They’re engineered to keep up with your demands, whether you're hitting the track or just enjoying a spirited drive on the weekend.