ACL 0.25 Oversized High Performance Main Bearing Set Nissan GT-R 2009-2024 | 4M2505H-.25

Product Fitment:

2009-2024 Nissan GT-R

For high‑performance builds and reinforced bottom‑end strength, the ACL Race Series 4M2505H‑.25 Main Bearing Set offers a premium main bearing upgrade for the Nissan GT‑R VR38DETT engine. Designed for engines that have been machined to accept oversized bearings, this set provides reliable crankshaft support under extreme conditions — from elevated boost levels to high RPM track use.

ACL’s Race Series bearings are manufactured with exacting tolerances and advanced metallurgy to deliver enhanced durability, improved oil control, and superior fatigue resistance compared to standard bearings. Whether you’re building a tuned street car or a race engine, these bearings help ensure your bottom end is ready for serious performance demands.

Engine Fitment

• Vehicle: Nissan GT‑R (R35)

• Engine: VR38DETT

• Bearing Size: Oversized +0.25mm — for engines with machined main journals

What’s Included

• Full set of oversized +0.25mm main bearing shells

Performance Features

• Race Series Construction: Premium tri‑metal design built for high load and extreme use

• Hardened Steel Backing: Increases resistance to fatigue under high‑stress conditions

• Grooved Upper Bearings: Promotes consistent oil flow to key crankshaft journals

• Precise Tolerances: Accurate wall thickness ensures reliable oil clearance and fitment

• Enhanced Heat Transfer: Optimized to maintain oil film and reduce heat build‑up

• Improved Load Capacity: Ideal for high‑power, high RPM, and boosted engines

Why Upgrade to ACL Race Series Bearings

Main bearings support the crankshaft and play a vital role in engine longevity and smooth internal operation. Upgrading to ACL Race Series bearings helps:

• Maintain stability and support at high RPM and boost

• Reduce the risk of bearing failure in extreme conditions

• Improve lubrication consistency and oil film strength

• Provide confidence in performance street and motorsport applications