ACL 4M2737H-.25 High Performance Main Bearings for 1984-1999 Nissan VG30DE/DETT

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Product Specification:

SKU:ACL4M2737H-.25

MPN: 4M2737H-.25

UPC: 9315726153062

Weight: 0.8 lb

Inventory: 8

Type: Bearings

Vehicle Fitment

1984-1999 Nissan 300ZX (Z31/Z32, VG30DE & VG30DETT 3.0L V6, RWD)

Fitment Notes

For VG-series Nissan V6 engines: VG30DE, VG30DETT; also compatible with VG20E/ET/DET, VG30E/ET/DET, VG30i, VG33E (validate with engine builder)
Does not fit later Nissan models or 2025; 2025 fitment unconfirmed.

Features

.25 mm oversized tri-metal main bearings for performance builds
High-strength overlay plate with reduced thickness to improve fatigue resistance
Hardened steel backing for enhanced bearing retention under high load
3/4 grooved design to optimize oil flow to rod journals
Increased crush tolerance for secure seating under stress
Enlarged chamfers to accommodate large crankshaft fillets
Tight, consistent wall tolerances for reliable oil clearance
Designed for high-RPM and high-stress endurance conditions

Specifications

Bearing size: +0.25 mm oversize
Oil clearance: Standard (H spec)
Material: Tri-metal construction with hardened steel backs
Half type: Upper and lower identical halves
Max overall length: ~19 mm (0.748 in)
Max wall at crown: ~1.83 mm (0.072 in)
Shaft fit range: ~62.951-62.974 mm
Bore tunnel fit range: ~66.645-66.672 mm

Included Components

8x main bearing shells (4 upper + 4 lower halves)

Product Description

The ACL 4M2737H-.25 High Performance Main Bearing Set is engineered for demanding Nissan V6 engines such as the VG30DE and VG30DETT used in 1984-1999 300ZX models. Offering a precise +0.25 mm oversize, these tri-metal bearings feature hardened steel backs, increased crush, and optimized oil grooves to ensure robust performance under high RPM and extreme stress conditions.

Featuring 3/4 grooving for enhanced lubrication, tight tolerances for consistent oil film formation, and chamfered edges to fit aggressive crankshaft fillet profiles, this bearing set is a solid choice for rebuilds or modified engines. While coverage is confirmed through 1999, fitment for 2025 or later models is unconfirmed - consult an engine specialist for cross-application use or alternative VG-series engines.