What does the 0.025 inch undersize mean for my engine build?

The 0.025 inch undersize indicates that these bearings are intended for use with a crankshaft that has been machined down by 0.025 inches. This is typically done during an engine rebuild to ensure proper oil clearance when the crankshaft journals are worn or have been resurfaced to a specific size.

Are these bearings suitable for a stock VG30DETT engine?

While these are high-performance bearings, they can be used in a stock VG30DETT engine if the crankshaft has been machined to the 0.025 inch undersize. For a completely stock, unmachined crankshaft, you would need bearings that match the original journal size.

What else might I need when installing these main bearings?

During installation, you will need to ensure the crankshaft and block surfaces are perfectly clean. Proper torque wrenches are essential for tightening the main caps to the manufacturer's specifications, and you'll also need assembly lube to coat the bearings before installation.

Specifications

Brand: ACL
Part #: 4M2737H-.025
UPC: 9315726153048

ACL Nissan VG30DETT 3.0L-V6 0.025 Oversized High Performance Main Bearing Set

Name: ACL Nissan VG30DETT 3.0L-V6 0.025 Oversized High Performance Main Bearing Set
Brand: ACL
SKU: acl-acl-nissan-vg30dett-3-0l-v6-0-025-oversized-high-performance-main-bearing-se-t14-114841
Price: 129.03 USD
Availability: BackOrder

$129.03

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ACL Nissan VG30DETT 3.0L V6 0.025" undersize main bearing set. High performance bearings for your engine rebuild.

Key Features

Fits 1993-1997 Infiniti J30, 1990-1992 Infiniti M30, 1997-2000 Infiniti QX4, 1987-1988 Nissan 200SX, 1984-1996 Nissan 300ZX, 1990-1994 Nissan D21, 1999-2004 Nissan Frontier, 1985-1994 Nissan Maxima, 1987-2000 Nissan Pathfinder, 1995 Nissan Pickup, 1993-2002 Nissan Quest, and 2000-2004 Nissan Xterra.
Designed for Nissan VG30DETT 3.0L V6 engines.
Main bearing set is 0.025 inch undersize.
High-performance bearing design for demanding applications.
Well-built by ACL, a trusted name in engine components.

No-fit, no charge. Wrong part? Send it back, free return label.

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About this part

Product Details

Already running a built VG30DETT? This set of 0.025 inch undersized high-performance main bearings from ACL is the next piece of the puzzle for your engine rebuild. These bearings are crucial for maintaining proper oil clearance between the crankshaft and the engine block, which is essential for oil pressure and the longevity of your engine, especially when you're pushing it hard.

ACL has been making engine bearings for a long time, and this set is well-built for performance applications. They're designed to handle the increased loads and heat that come with a modified or high-performance VG30DETT engine. The 0.025 inch undersize means these are intended for use with a crankshaft that has been machined down by that amount to ensure optimal clearance and oil flow. This is a common practice when rebuilding engines to bring worn or damaged journals back into spec or to achieve specific oil clearance targets.

When you're rebuilding an engine, especially one like the VG30DETT that can be found in a variety of Nissan and Infiniti vehicles, using quality bearings is non-negotiable. This set is a solid option for anyone looking to ensure their engine's bottom end is as reliable as it is powerful. Make sure to follow the manufacturer's installation instructions carefully, including proper cleaning of the crankshaft and block surfaces, and torquing procedures to get the best results.