What is the difference between standard and undersize bearings?

Standard size bearings are meant to be installed when your crankshaft journals are still within the manufacturer's specified size range. Undersize bearings are used when the crankshaft has been machined down to correct for wear or damage, requiring a bearing with a slightly smaller inner diameter to maintain proper clearances.

What does 'Version 4 Block' mean for these bearings?

This indicates that these specific bearings are designed to fit the Version 4 engine block configuration for the Nissan GT-R. It's important to ensure your engine block matches this version for proper fitment and performance.

What else might I need when installing main bearings?

When replacing main bearings, it's critical to have a clean working environment. You'll also need engine assembly lube to coat the bearings before installation, and you should always follow the manufacturer's torque specifications for the main bearing caps.

2009-2024 Nissan GT-R Main Bearings | ACL 1M2505H-STD-4

Name: ACL GTR Standard Sized High Performance Main Bearing Set (Version 4 Block)
Brand: ACL
Price: 61.30 USD
Availability: InStock

ACL GTR Standard Sized High Performance Main Bearing Set (Version 4 Block)

$61.30

In Stock

Fits 2009-2024 Nissan GT-R. ACL GTR Standard Sized High Performance Main Bearing Set (Version 4 Block) for your engine.

Key Features

Fits 2009-2021, 2023-2024 Nissan GT-R.
Standard size bearings for direct replacement when crankshaft journals are within factory specifications.
Features a high-performance overlay material to withstand increased loads and temperatures.
Designed for Version 4 engine blocks.
ACL is a well-known manufacturer of engine bearings.

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Fits this vehicle

Nissan GT-R 2009-2021, 2023-2024

Product Details

ACL has been making engine bearings for decades, and this standard-sized main bearing set for your Nissan GT-R (Version 4 Block) is one of their staples. These bearings are crucial for keeping your engine's crankshaft spinning smoothly within the engine block. They sit between the crankshaft journals and the engine block's main caps, reducing friction and wear in a high-performance application like the GT-R's VR38DETT engine.

This set is built with a high-performance overlay material, designed to handle the increased loads and temperatures found in performance engines. The standard sizing means they're intended as a direct replacement for your original bearings, assuming your crankshaft journals are still within factory specifications. If your crankshaft has been machined or is out of round, you would need to look at undersize bearings instead. ACL is well-known for their consistent quality, making these a solid choice for rebuilding or refreshing your GT-R's engine.

When installing these bearings, it's important to ensure the engine block and crankshaft are perfectly clean. Any debris can cause premature wear. Always refer to the manufacturer's installation instructions for specific details regarding clearances and assembly procedures.