What does '.25mm Oversized' mean for these main bearings?

This means the bearings are designed to fit a crankshaft that has been machined down by 0.25mm. This is a common practice during engine rebuilding to clean up minor wear or imperfections on the crankshaft journals.

What GM V6 engines does this bearing set fit?

This set is compatible with GM engines designated as LAU, LP1, LP9, 183 LF1, 217 LFX, LLT, and LY7. It's important to confirm your specific engine code matches one of these.

Do these bearings come with assembly lube?

This set includes the main bearings only. It is recommended to use a high-quality engine assembly lubricant during installation to ensure proper initial lubrication and protection.

Specifications

Brand: ACL
Part #: 4M2273H-.25
UPC: 09315726435212

ACL GM 170 LAU/LP1/LP9/183 LF1/217 LFX/LLT/LY7 .25mm Oversized Main Bearing Set

Name: ACL GM 170 LAU/LP1/LP9/183 LF1/217 LFX/LLT/LY7 .25mm Oversized Main Bearing Set
Brand: ACL
SKU: acl-acl-gm-170-lau-lp1-lp9-183-lf1-217-lfx-llt-ly7-25mm-oversized-main-bearing-s-t14-801909
Price: 251.16 USD
Availability: BackOrder

$251.16

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Key Features

Fits 2004-2012 Buick, Cadillac, Chevrolet, GMC, Pontiac, Saab, and Saturn vehicles with specific GM V6 engines.
Main bearing set is .25mm undersize, intended for use with a machined crankshaft.
Supports the crankshaft, allowing for smooth rotation within the engine block.
ACL is a well-known manufacturer of engine bearings.
Designed to handle the demands of daily driving and performance applications.

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About this part

Product Details

Already rebuilt your engine or looking to fine-tune it? This ACL main bearing set is a solid option for those working on specific GM V6 engines. These bearings are crucial for supporting the crankshaft, allowing it to spin smoothly within the engine block. When you're rebuilding or refreshing an engine, using new, properly sized bearings is key to ensuring proper oil clearance and long-term reliability.

This particular set is .25mm undersize, meaning it's designed to be used when the crankshaft has been machined down by 0.25mm to clean up any wear or damage. ACL is a well-known name in engine bearings, and this set is made with their experience in mind. They're built to handle the demands of daily driving and performance applications, providing a reliable foundation for your engine's rotating assembly. Proper installation, including ensuring the crankshaft journals are clean and within the specified tolerance, is essential for these bearings to perform as intended.

This set fits a wide range of GM vehicles from the mid-2000s to early 2010s, covering popular V6 engines like the LFX, LLT, and LY7. Make sure to verify fitment for your specific year and model before ordering. When installing, always refer to the manufacturer's service manual for the correct torque specifications and assembly procedures.